I fell for the.45 version... Nice enough site, but I don't see carrying a pistol with the protective cover on the red dot. I'm not crazy about the lack of manual switch and controls on the SMS, but haven't had any chance to try it on a range yet. At any rate, eventually I hope to put on a Holosun 507k whenever the maker finally starts filling dealer orders; one day in a green reticle version, I hope.
Different issue, for me, though. I can live with everything but the trigger. I had my hopes up after reading a number of reviews praising the Performance Center trigger. To be fair, I have only got a couple hundred dry fires, haven't had the time to tear it down, clean it up and add special magic lubrication. And sometimes a substantial break in is necessary to settle in a trigger and other functions. But — the first person to look at it after I got it winced when they pulled the trigger. Much as I did. The second friend to drop by didn't actually handle it, but when I took up the slack of the initial stage preparing to dry fire he was standing about 8 feet away. He said "That doesn't sound good ".
I hope it smooths out quick. I'd be inclined toward an Apex trigger drop-in kit but I would need to call them as I'm not sure they have a trigger for my particular model and caliber. Heck, I'm inclined toward an Apex trigger anyway, although I have only fired one full size M&P with their kit.