I have had one for several years. I love it. I had trouble with Glks fitting
my hand. One local LEO let me shoot his 45FS MP. I shot it for the first time at 25 yds in a B 27 target, they were doing Quals at our range.
Shoot all 10 rnd in the 10/X ring first time. When out and bought one asap. Small BS fits fine. I had an APEX sear installed. Better trigger pull.
Works with all brands of ammo. I think you can't loose with MP 45 FS.