I have one. Love it. My only gripe is that mine is picky about what mags it takes. Or at least about a third of all C-products mags either have trouble ejecting (get stuck) or feeding. They work fine in my AR-15 though.
What are you getting for accuracy out at 100 yards? I'm windering if I should rebuild my 223 upper for my AR, or if I should save up and purchase a new, different rifle.