Its comfortable but not for everybody
This is probably by far the best explanation of the controller.
I bought one for an ex, who proceeded to use it to replace every possible controller she could get her hands on, I never expected in my wildest dreams it'd get that much use out of anyone.
I just like them, enough to use them every so often, usually for platformers, rarely for anything else.
But I do get why everyone doesn't care for them, they are strange, the quality isn't absolutely top notch, and "flinging thumbs" is a huge problem of it.
I do wish more of Steams "Game on Linux" push went through, not that it hasn't helped a ton, but I can only imagine how the world would be now if they had just a little more might to push behind it with.