I bought the classic upper on Monday and it arrived Friday. I had it out all weekend and I'm extremely pleased with it. I shot it with various standard and HV ammo and with maybe 500 rounds fired, I had only one failure to extract which I didn't even realize until I had a failure to feed and after clearing, another failure to feed. It wasn't a feed problem, it was because of the spent shell in the chamber which I didn't see. Other then that, feeding was 100%. There was one instance of the hammer failing to reset, and that was shooting with standard velocity Federal match ammo. So really it was just 2 minor issues in over 500 rounds fired. Accuracy wise, it's no different then the 10/22 I have and most likely outshoots me. I love the thing and it was $300 well spent.
ETA: The bolt looks exactly like a CMMG bolt but instead of the chamber insert it just has a collar which fits over the dedicated 22LR barrel.