I have full size APX with something between 1000 and 2000 rounds (it flies when you have fun)
Trigger was good from the box, cant say that i remeber some changes like "breaking in". Its duty style whit some takeup to realize you actually pressing the trigger and then solid wall. In comparsion with P10, i like APX trigger more (actually i like all APX more than P10). For some ppl may be problem in fact, that trigger is actually little bit further from back of grip (that part is wider)
I heard complain about disassembly but honestly, i dont get it. Mayabe because i was used to Cz 75... you just dry fire, then press button on one side and push lever on other side. Thats it. It can be stiff at start, but you just clean it around button from inside and its ok.
Recoil spring stays in. If its keep falling off i would suspect factory lube keeps getting in holds while shooting.
I would prefer more sharp/deep grip undercut, but its probably just my preference since most of strike fire guns have same
Factory sights was quite a pain because even with a big amount of effort i was unable to get to use to tham and had to black out front. Over here its quite uncommon so i really dint find out if somebody will change my that sights (and i dont want to pay for tool or "hammer it")
Overall its great gun which will outlast me. Currently im even thinking about getting Beretta "competiton" recoil and trigger springs. Its even my carry weapon. Slide does look big, but its actually just visual. My only regret is that i didnt get "combat" version with threaded barrel and optic sight cut
Btw, there is already topic about APX with 5 pages of posts
here