I put an MOE on 15-22 for awhile off of another rifle. I like to run my stock fully extended, and in this position it had some annoying wiggle. It was nice and tight when closed at least half way though. I bought a CTR and it fixed my problems. It's nice having the QD socket too, but not worth the extra money for most.
I did fix a little bit of wobble on the MOE for the other rifle though. I single piece of electrical tape on the top of the tube is all it takes. Obviously it needs to be in a spot that gets covered by the stock body when you get it into position. Make sure you only get the tape on the rounded part of the "buffer tube" and not on the track where the lever locks into place.