Fired over 500 rounds in my new 5.25 9mm with very satisfying results. I use the largest back plate and added the rubber decal grip which is excellent. The front fiber optic is very easy to pick up and my groups at 25 feet are very tight. At 75 feet I have consistent groups in 4".
Only once did the slide fail to lock back on last round. One peculiarity, when I first test the gun the mag would not drop when it still had two or more rounds left in it. I t had to be ripped. This cleared up after a little usage.
the 5.25 has nice balance and the grip is a great fit.
I also shoot Glock 19.9 with lone wolf extended barrel and competition trigger, but the XDm is in first place now.