I've had this gun for about a year, and for it being my first "good" AEG, I haven't had any problems with it. Probably because I keep it cleaned and grease the gears. Take care of any gun, and it'll take care of you. ONLY problem I've really had is the classic problem with Chinese clones, is the cut off lever falling out of time and locking the trigger in semi-auto. Never could really figure out how to fix this, so if anyone has any insight, please let me know.
I may just upgrade this gun and make it a beast, or just upgrade to a better gun entirely. There's a nice H&K416 that's caught my eye, so, yeah. ;p