I've heard a lot about their trigger pull, which doesn't seem to affect me for what I currently use the gun for (hunting and plinking). I mean, do you really need to dump the lil 10rnd mag in half a second?! No, probably not lol. The 64 shoots plenty fast for me anyway. But, a lil love on the sear and fixing the play before engagement will help nearly any gun, from any manuf.
As for the aftermarket, it is quite thin. But I didn't want a 10/22, it's like driving a V6 or a GT 'Stang, they're like a plague!!! I step away from the norm and get a lil weird.