Love them on my VP9 though, the Trijicons are very close to stock height on that set. I never did hear back from Trij why they packaged the M&P set with such odd heights.
I have the Ameriglo Hackathorn on my M&P45c and can't complain. Same concept as the Trijicon HD. I do have the HDs on several other non-S&W guns and love them just as much. You can't go wrong.
I like 'em. Quick on target. Excellent in dark or low light environment. Of course very easy in daylight conditions. I use the HD's on several of my handguns and just find them very easy and reliable.