I've had access to a 2.0 for quite some time now, but obviously could not say anything about it. I like it quite a bit, and I'd be perfectly happy carrying one if it was issued to me. There is probably nothing I can add that you don't already know, so I'll just throw some pics in.
First pic is of the three SIMP's I took out today. I do love the M2:-)
Second pic is the steel I hit 10 for 10 at 30 yards with the 2.0
Third pic is the average group I shot today with the 2.0. It is right about 3.5" Temps are a windy 20 degrees, so I will absolutely assume the gun can do better. Also, this was with federal 147g American Eagle, which was the only round I shot through it. No idea what else will do what in it. My final excuse is that I did tend to anticipate on the trigger. Clearly that is my fault, and I attribute it to loss of feeling in my fingers, plus unfamiliarity with the gun. I suspect that after a few hundred dry fires, I would not have that issue.