I picked up a couple when Wholesale sports had them for $140. Only opened one so far, the front sight was loose. Just got out to shoot it last night, POI was way off from POA, I guess I didn't tighten it quite straight. Also I was getting some pretty bad failures to feed with factory Ruger mags, to the point where cases were getting dented. I think this was in part due to the magazine release not holding the magazine in. I'd seat the mag, make sure it was in there nice and tight and flush, and then a couple rounds later it would start to come loose under recoil.
I'll have to play around with it some more and see how it and the 2nd one I got do. If I had paid full price for them I'd be a bit disappointed but at $140 I can't really complain.
Also, because of the way the front sight is mounted, that limits your options in some respects. Anything that needs to mount to the dovetail for the front sight on a normal 10/22 won't work, such as Tech Sights or from what I understand the dummy suppressor on the Archangel Nomad kit.