I have the cheepest version of the CMMG and it works really well for me.
The advantage over other .22 options is that its cheep, and compact. Some will say that a dedicated upper or entire .22 gun are better options, and they are right, but they will cost more money and add one more bag to take to the range.
I am hoping one day I can the bolt hold open thingy so that my bolt catch will function. Right now the bolt is held open buy the magazine follower.
The blow back design will dirty your lower a bit, and apparently you can gum up your gas tube, but I havn't found this to be the case.....yet.
Accuracy is acceptable. Never sat down and checked it formally, but it is defiantly "minute of steel plate"
I do look at my buds S&W MP AR22 with some envy but the 10 rnd mags suck.
GC