OK, I test drove mine today. It works great. Like all .22lr semi's this one had a few jams especially when it got dirty. Most were caused by incomplete extraction and resulted in the spent case being crushed by the bolt on the second pass.
I tried Fed 510 Lightning - works OK, not 100%
Fed 745C bulk copper plated works 100%
Fed 710 Gameshock plated works 100%
Fed 510 Champion (likely the new branded Lightning) works OK, not 100%
Winchester Wildcat, indifferent performance, regular jams
CCI Velocitor, would not feed
I had to mount my Bushnell Holosite instead of the Leapers as my rings are too short, so I didn't worry about accuracy, just group. All grouped well
During the range session of about 600 rounds, I ran the bore snake through it three times. I also had to stop shooting after 200 rounds as the magwell and trigger housing screws had become loose and had to be tightened.
Once back home I took the stock and lower off and cleaned the beast, without completely removing the bolt. It's very well built.
My only major complaint about the gun are a very few assembly issues, like the loose bolts and the mag catch roll pin not being seated deeply enough, and the poor quality safety lever. A relatively minor issue is that this gun can fire out of battery easily, and if you let it get very dirty and use crap ammo, eventually one IS going to burst on you. Use clean ammo and run a bore snake down it every few hundred rounds, and I don't think you'll ever have a problem.
I think this gun is a great value for the money, and I would buy another in a heart beat.
If you are thinking about getting one, I don't think you will regret spending the cash.