I'm testing one out with an M&P45, Surefire X400V and Ti-Rant 45. I had to fabricate a mount plate to get it where I wanted on the war belt, but that's just my G-Code setup. It has a little wobble, and reholstering takes a little technique, but even with the wobble it seems pretty secuve. The thumb release works quite naturally for me, and the extra security is what drove me to test one against my T-Rex unit. That is fairly easy to lever the gun forward out of the holster, so getting in and out of the SxS in gear is a bit of a challenge. I won't have a chance to run it in a full on class for a couple months, but so far, so good.