I own one and use it in 3 gun, I have put over 500 rounds through in one day, tried to shoot fast enough to jam it, and run it without lube for 700 rounds or so, all without any issues.
after about1250 ish rounds total now, still runs like a champ, I also own a norinco, but I will be putting a NEA barrel in it when the original is worn out.
and for the couple extra hundred bucks I feel I got a gun worth 1500 EASY, really good value with this gun, I think noveske, vltor (maybe more?) are the only ones doing the angled look on the upper and lower, and I really like that look, very different from standard m4gerys
the barrel is PHENOMINAL, my 7.5 NEA is more accurate then my 14.5, but depending on who you talk to, better accuracy is normal out of a shorter barrel.
long story short
1250 rounds in, no failures, at 750 rnds I did have to tighten a gas block screw, since during strings of "rapid" (as can be with 10 rnd mags in a semi) I got the barrel red hot.
nothing an allen key and 2 minutes couldnt fix, last 500 rounds have not budged the screw a bit.