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I've got one of the larger NCStar's, and was almost ready to say it wasn't working well - then found the problem was my mount. Now it's holding zero nicely, and the optics are more than I expected given it's price.
It's no Leupold, but then again, I didn't pay Leupold price either.
This is an an M14, incidentally, and the recoil hasn't shaken it to pieces yet
I'm not sure about their scopes but I have one of their big honking red dots on a bushy dissipator. It is still holding zero after a few thousand rounds. For what the stuff is worth it is not a great loss if it goes funky.