The first one I ever ordered from them for an M&P 2.0 9mm was perfect so I decided I'd get them for my other 2 M&P's and they were absolutely terrible because they teetered from one end to the other and didn't sit flush in the cut-out. I actually could see daylight underneath them.
I thought maybe the pin for the extractor was sticking up a little bit, and CHPWS even mentioned that it could be what was causing them not to sit flush, but it was just a poorly manufactured plate.
They also got lazy and stopped machining all the way through for the two round center lugs on the Smith and Wesson M&P factory cut out now, and just mill a channel out for them which is probably why they no longer sit flush in the slide.
It sucks because I really wanted to try a Wather PPQ 45 acp that are discontinued now but I want rds on all my pistols now, and they are the only one I could find that would mill the Wather 45 acp PPQ. From what I have been reading the past year or so about their plates and their shotty optic milling, it has me second guessing getting one of those.