Amazon.com: Customer reviews: LEGO Technic Liebherr R 9800 Excavator 42100 Building Kit (4,108 Pieces)

Top positive review

Really well detailed build and a great investment for a hobby

Reviewed in the United States on August 9, 2021

About the experience
its a massive set - so it will take time , but it is a really pleasent experience, hats off to the designers to make the whole process a seamless routine. Great details overall, the special parts for this assembly seemed to be really nicely made, nothing too small. 4000+ pieces is a challenge in itself - but everything is arranged and sorted neatly to follow the steps for the build.
Once built and setup the movements are really precise- precise in terms of a LEGO set. And the assembly does seem to be really sturdy
Moement of the caterpillar tracksis limited to few surfaces , but it works well on flat areas.
its a great build for hobbiest's, or for young adults, I wouldnt recomment kids to work on it by themeselves as it requires quite a bit of patience.

Drawback
the app is a bit irritating at first to use, it doesnt seem refined to work on a touch screen device.
The whole machine does require 12AA batteries- I really wish LEGO would just provide a rechargeable setup for this build.

Shipping
i got this shipped to India through Amazon.com- really fast convenient from the seller to ship it .
but yes there will be a lot of delay at customs and usually they will open up the box to check the contents for "security purposes"- it is a risk but not much of a choice on that front.

3 people found this helpful

Top critical review

Critical reviews›

SANTIAGO

Model is great, App is disappointing

Reviewed in the United States on October 22, 2019

The model is amazing, I cannot lie. However, I kept getting angrier and angrier while building this model, as I was not allowed to play with the motors, as I could with any previous generation of Lego motors. I just wanted to take the motors and plug them to the new linear actuators to see the possibilities before building the model, test the motor speeds, torque, etc., but no.... that's impossible. the App would only let you control the motors once they are plugged in the exact configuration required by this model. So, if you want to get creative and create your own constructions (what LEGO should be all about), you are out of luck. You are stuck with building the one model this set lets you build. For any serious Lego fans out there, I would hold on purchasing this until Lego updates the app, or until there is any 3rd party options to let you play with the motors, otherwise, you are just building an expensive remote controlled crane, instead of a Lego set...

47 people found this helpful

766 total ratings, 175 with reviews

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From the United States

Amazon Customer

Really well detailed build and a great investment for a hobby

Reviewed in the United States on August 9, 2021

Verified Purchase

3 people found this helpful

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The Billmeister

Excellent Product

Reviewed in the United States on June 20, 2023

Verified Purchase

This item showed up in pretty amazing box condition considering how far the item had to travel to get to me. It was packed well and it showed up today 6/20/23 instead of 7/5/23, which totally surprised me. You have to be patient with this vendor, but the item does show up as expected. Plenty of tape used. Plenty of labels on the box to make sure it was not drop kicked and abused during transit.

One person found this helpful

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Triumph Sprint Rider

A challenge but well worth it.

Reviewed in the United States on June 23, 2020

Verified Purchase

My third Technic and what fun they are to build! The engineers who design these Technic toys are incredibly smart. Instructions are well written but you must pay careful attention to every detail when building as missing one note may cause you to disassemble in order to correct the mistake. Luckily all the parts simply snap together so disassembling is not a big deal. The motors (5) and controllers (2) are all state of the art and work intuitively & flawlessly from an app on your phone.

One person found this helpful

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Zachary Simmons

Fun to build, pain in the thumbs

Reviewed in the United States on February 16, 2022

Verified Purchase

I love this set, it was fun to build but left some sore thumbs with the little colored pins and the number of ones needed for this set. The "replayability" of the Control+ app make the model that much more fun to play with and get it to move round or pose it for display. FYI this requires 12X AA batteries for the 2 control boxes, which take 6X each, which are needed to have power through various build steps to function test the power functions and movement of assemblies. SO make sure to have those on hand when building this!

Helpful

Bob Ackerman

Great Build Kit

Reviewed in the United States on June 20, 2021

Verified Purchase

While it does take many hours to build, this is a great kit for adult Lego builders. Large detailed manuals walk you through the construction. Multiple motors provide complete control of all movements. Connected to the phone software, this becomes a true radio controlled vehicle. I too the time to disassemble, using the manual in reverse order, and plenty of gallon size zip lock bags, so that I can rebuild it in the future (or let my grandson do it when he gets older).

Helpful

Rick Angelone

Be ready, it's a big one.

Reviewed in the United States on March 24, 2021

Verified Purchase

FIRST REVIEW (3/24/21) I am starting this review after completing the first 2 (that's right 2) bags and man it is huge. So far so good and it is good that you can test it as you go with the app. My usual complaints remain however. The instruction are vague and well suck. The print on the pages is hard to make out so counting holes is really hard and with this monster you have to be right all the time. Some of the instructions must be in the designer's imagination and are difficult to perform. They just seem to stop thinking when they make them. Overall, I like it but worth the price? I'll get back to you.

SECOND REVIEW(3/29/21) Finished it the other day. I have to say I am amazed that everything worked as stated the first time. Being able to test the design as you build is a HUGE plus. I am finally able to use it to its fullest extent. Forward, reverse, left/right turn in both directions good. If I have one suggestion they need to improve the tractor system it is not as smooth as it should be but acceptable. Rotation is dead on. Operating the arm and bucket are also very good. The multiple ways to control it is also a HUGE plus. Thus, I raise it to 5 STARS. I am also getting the Volvo hauler as a companion. CHEERS!

Helpful

Xargon321

Nice set just a couple of flaws

Reviewed in the United States on December 22, 2019

Verified Purchase

Very nice set really big and its detailed. The only this I would wish for it that the instructions tell you to test the model when done building a module, however they dont tell you that you need to have all motors hooked up and in the right spot on the motor controllers to work right. Maybe update the app to let you test motor controller separately and a way to tell you what motors are hooked up where and if it's wrong. Also "AA" batteries??? 12 of them at least have the option of lithium batteries you get better power out of them and wont be sending so many batteries into the landfill because the battery trys are removable I would like to see some alternative battery setup in the future

9 people found this helpful

Helpful

Todd S

Early control app, ridiculously well engineered physically

Reviewed in the United States on October 14, 2019

Verified Purchase

Things I liked
1) Brilliantly engineered kit. You really have to build it to recognize the complexity and the skill of the designer.
2) It has a bazillion pieces and takes forever to build. If you are paying this much, the fun should last, right?
3) Lego has mastered construction manuals. Not one word. It was pleasurable to follow. No cussing occurred.
4) It's for reals, full-tilt RC using your phone or tablet.
5) Motors, gears, tracks, linear actuators, oh my
6) The motors have high resolution control. Not just on/off. Variable torque/speed FET driven goodness. Just like RC stuff has been since, well, the mid 80's.

Things I didn't like
1) Holy mega bucks. It's amazing the practical things you buy can instead of this. I could buy shoes and a week of groceries for my entire family for what this cost. Those things are stupid and boring, but ya.
2) As of right now, the app is "minimum viable". It can run this kit and one other. Want to take it apart and make a dozer? Nope. Make any other contraption your imagination can muster? Nope. I trust that some day you will be able to use the motors with these new controllers and app any way you wish, but it's not today. And given the challenges that I can imagine making it this flexible, it won't be soon that you can.
3) The tracks are loosey goosey and the model will cog slip/skip, especially on rotation on non-slippery surfaces. I fixed it by raising the upper bogey wheels. You can remove one link in the tracks but then it is way tight.
4) I want to take it apart and make something else, but I can't because of the immaturity of the app. So I just have trophy now. I am 50. Not to many of my friends are impressed, so it doesn't even work very well for that.
5) I wonder what we will think of a model of a coal mining machine made out of 4108 bits of plastic in 20 years?

154 people found this helpful

Helpful

Santa CruZin

Great Kit - Beware some negative reviews

Reviewed in the United States on February 21, 2021

Verified Purchase

My elderly dad builds these advanced LEGO kits to stay focused and engaged on projects. We call this one "The Beast". It's a fantastic build. I'm dinging it one star because of the iPhone app - it's easy to find yourself locked into submenus of macro builders and other features that can't be recovered from without dumping the app from the phone's memory and starting over. Starting over involves re-linking the Bluetooth systems. It's not a huge deal, but it gets frustrating when trying to have fun with the completed model. I'm not sure why certain reviewers are suggesting LEGO won't send replacements for missing parts - we've put together probably 20 advanced LEGO kits over the last 2-3 years and we've never, ever had problems getting missing parts sent out immediately. The four-star rating is due to the app. The build is stellar.

One person found this helpful

Helpful

Drew Marold

Cool model, but not as interesting to build as others

Reviewed in the United States on March 25, 2021

Verified Purchase

I'm torn on this one. While it is undoubtedly a very cool model and I like the new PowerUp stuff, it was nearly as interesting to build as the last 2 big Technic models I've done, the Mercedes AROCS truck and the blue crawler crane. Those 2 are marvels of engineering to drive all the different functions with a single motor. But the Liebherr, with its 7 different motors does have that challenge to overcome, and the build is essentially a long exercise in structural reinforcement with an epic amount of greebling at the end. I don't regret buying it, but given what it cost I was a little disappointed by the overall experience.

3 people found this helpful

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