I have one of the Moto Edges, can’t say I have many complaints outside of the slow charging and a dead pixel that developed a year in.
The edges didn’t bother me as much as I thought it would, I can even use it as trigger to play Citra games which I couldn’t do with a flat phone so that was nifty. Clean software, long battery life, but terrible update schedule though.
As often as moto phones are praised for this feature, the reason has to be that they own a patent on this and other manufacturers are not allowed to just copy it. Can’t imagine it’s difficult to do with some customization though.