I've fired several hundred rounds of 40 grain American Eagle with no failures but I've had two failures to feed (out of 10 rounds) with the FN 198 27 grain ammunition. BTW: The American Eagle seems to have sloppy tolerances with OALs ranging from 1.57" to 1.59".So far I will say I like mine, but it hasn't been perfect. I had two malfunctions in the first 200 rounds, both seemed to be mag related. One was a double feed, the other the last round in the mag ended up doing this:
I have to wonder if maybe it was operator error when loading the mags, since the second time I had the pistol to the range I fired 150 trouble-free rounds. All ammo fired has been 40 grain American Eagle.
The trigger is......funky. The gun is a "single action" hammer-fired design, but it has a trigger that feels like a striker-fired gun, and not a very good one at that. Paul Harrell's video posted above illustrates this pretty well. I put "single action" in quotes because when you pull the trigger, the hammer moves ever so slightly back before dropping. Again, kinda like a Glock or similar design where the striker is partially cocked.
I really had to adjust the rear sight to compensate for shooting low and left. Again I wondered if it was just me, however I have heard a few other folks online mention this. Still, could just be me. I do like the combo of a green FO front sight and a blacked-out rear. The thumb safety work well, engages and disengages positively.
I know I kinda have knocked the gun for a couple things but I do like it. It feels nice in my hand, fit & finish is nice, and its easy to field strip. I also enjoy shooting 5.7x28 quite a bit. I'm starting to like these light, fast pistol rounds. I also have a 22 TCM that I really like shooting.