Their replacement parts cost almost as much as the last Xbox controller I bought. They are frequently available for $40 USD and pretty much always for $50, the replacement PCB is $35 and that's only half of it.
Both PCBs, motors, and buttons are over $90 USD, and no that's not for the elite controller.
I just replaced my bumpers a month ago and its less then perfect. Im not sure whats causing the issue, but quite frequently when i press down on one of the bumpers itll raise the other just enough to give my finger a love tap. It so far has no negative consequence, just feels a bit weird.