I have bought an M-14S and a 1911 from them. I found the sales e-mail to be fine but support awful slow, but they have always answered.
As for the actual Norinco products The M-14S is decent but my rear sight is drilled off center and it's sloppy (the sight). The wood was awful and required considerably work to get it to harden up and stop bleeding cosmo all over the place. The fit and finish is much lower than the Springfield Armory Inc rifles however for the cost difference you can fix up the M-14S and have a much better gun. The accuracy leaves something to be desired and varies quite a bit with ammo. However you have you consider you just bought a $400-$550 semi-auto 30 cal, what do you want?! Do you plan on taking long range shots at coyotes with it? I don't.
The 1911 is just fine for a "mil spec" except that the sights it came with shot really low, like 1m at 25m, however fixing this is cheaper (free if you already own a file) than shipping it back to Marstar to get it fixed. Don't expect nice tight groups like you may have gotten from higher end 1911s, they're sloppy, just like the original and mine preforms about as well as other low end 1911s I've fired.
Neither the M-14S or 1911 have ever experienced any kind of a mechanical faliure.