The installation for Z73 was easy enough in my case and had no problems. I did replace the fans with corsair ll 120s because I wanted to have my rgb with my case. I have to say those fans fit perfectly if you want to do the same. Also my case made it easier to put in, since I could take the top panel off for an easy install, just keep in mind how your case will allow you to install.
The LCD screen is a nice touch for constant temperature showing when running stress tests and benchmarks to see how it's performing. The best thing about the screen is that you have an added part to your lighting and make it an interesting part of the theme you are doing. I do multiple themes for my setup and it is great for changing up your looks as much as you want (Sunset theme in video). It adds more to your build to have more fun with the theme your going for.
The noise level is quite good with this aio. If your looking for a quiet aio, the Z73 is a contender because on quiet mode you can't really hear it and still cools very well, never really went past 65c (don't have the best ambient temperature and never reapplied paste). I usually have headphones (Corsair Virtuoso) on and have it running on performance, where it is louder but with headphones on I can't really hear the pump and fans. If you aren't using headphones, the noise is noticable but if you have your speakers running, it's not too bad. It just depends on how close you are to your pc. I have my on desk but I also have it connected to my tv and I will be a bit of distance away and can't really hear it when gaming off the TV.
The only problem I have to say with this cooler is the cam software. The monitoring side of the software loves to act weird after an update for a week and give you some weird readings. It reads my gpu as running at 527 degrees sometimes because it doesn't registers the demcial point because it was running at 52.7c. Also the software doesn't remember your previous setup sometimes after an update and resets your settings for mode your running and the LCD screen. Also if you are running a ryzen system, your temperature will fluctuate a bit because cam and other softwares can't read as accurate as ryzen master, so don't be worried when it jumps around in temperature.
Summary
Pros- Install, Cooling, Noise, Looks, Performance
Cons- Cost (if you are worried about the cost), CAM software, non rgb fans included