First off let me start off by saying that I chose not to mark off any points for any of the issues I had due Linux. This product is not designed for Linux, it is not advertised to be compatible with Linux, and any problems I faced are purely my own for buying this over something that does advertise Linux compatibility. That said, I will be talking about my experience on Linux as Linux users often have to make the choice between buying a worse product that will definitely work, or a better one that will maybe work.First, let me talk about the controller itself. This is by far the BEST controller I have ever laid my hands on. It is extremely clear to me that every single detail was painstakingly refined to bring us this product. Everything from the looks to the physical build quality is absolutely flawless and I am extremely happy when I am using this thing. The grips are hard plastic and feature a texture similar to knurling that not only really grippy, but seems like it will help minimize the impact of sweaty hands (though I haven't owned it long enough to say for certain if this is the case).As for the input, the sticks perform about as well as you would expect, but the feel of the sticks is really good. The edges of the stick cap are knurled so they are extra grippy and unlikely to slip in intense gaming sessions. The face buttons use clicky mechanical switches and they feel and sound exactly like clicking a mouse. In games I actually really appreciate this additional auditory feedback as in kart racers where you have to time when you start holding the gas, its good to be able to hear how far off you were.The D-Pad was my biggest worry and I can honestly say that I am relieved that this D-Pad is good. It is very easy to make a D-Pad that FEELS good and for most people that's all they need to speak highly of it. It's an entirely different challenge to make one that PERFORMS well. Most modern D-Pads I have used are too sensitive on diagonal inputs which makes certain retro games or fighting games pretty hard. With this each of the 8 directions have a noticeable click, and its hard to actuate a diagonal input unintentionally, even when you rock from 1 side to the other.Now on to the Linux sectionLet me start by reiterating that this DOES work... There are just a couple pretty nasty caveats. When I first got this controller, I saw that it supported both xinput and direct input and I assumed between one of those 2 that it would work. When the controller arrived and I go to plug it in for the first time it lights up in xinput mode... and then immediately turns off the light. I go around trying to follow the instructions to change the modes and it nothing happens at all. I then start poking around my system to try to debug whether the system even sees the controller and I end up spending 3 hours trying to figure out SOMETHING that would let me keep this glorious thing. Then later I found out that in order to change modes I had to HOLD the buttons as the controller is powering on and suddenly the first thing I thought to try turned out to be the solution. As for the "nasty caveats", the only mode on this controller that works with Linux is Android mode. Xinput mode immediately shuts off after it powers on, I couldn't figure out how to access the controller with direct input (though I didn't try very long), and Nintendo Switch mode ACTUALLY FREEZES MY SYSTEM. To add to this problem, this is a wired only controller that realistically you might want to leave connected to your system at all time. The problem with that though is that for some reason during the bootup process the controller tries to boot into Nintendo Switch mode so I either have to have it unplugged when booting my system, or babysit the controller so it boots into the correct mode. Also while I don't know exactly what is happening, I believe the controller is interfering with Steam's ability to launch as well, so it is best to not even plug it in until Steam launches.Once you have it working it performs really well. You lose access to features such as rumble and gyro, but a lot of configuration features of the controller are accessed from the controller itself, so you get access to stuff like hair trigger mode, switching A and B and X and Y, and most importantly, programmable back buttons. You can also adjust the lighting to one of four modes (which is better than nothing) and you can change their brightness or turn them off if you don't care about them. I do not have a windows machine to test if configuring it on windows will stick when you switch to Linux, but if that does then that would be great.Conclusion:Overall, if you are a Windows user, you are going to have absolutely 0 issues with this controller. It's an excellent controller and supposedly the configuration software is pretty good. If you are a Linux user and you are OK with all the workaround you need to do to get this controller to play nice with your system, then physically, there is nothing that should prevent you from enjoying this controller. Though again, on Linux, you DO need to leave it unplugged when you aren't using it.While I know that getting full Linux support is a lot to ask of any company, I would really like if GameSir at least tried to offer a bare minimum level of support for Linux (I.e. boots into a mode that works by default and not into a mode that hard freeze your system on boot). It is very clear from using this controller that the engineers considered every tiny detail of this controller and put a lot of love into polishing it to perfection, and I would love if future products by this company were more widely available on other platforms.