Just got in the Battle Comp from Lt. Normandy in CA (the gun guru on Mythbusters) to T&E and I have to say that I'm impressed. Muzzle control was exactly what you expect from any compensator: the muzzle just stayed still. We could do a full auto, full mag dump with just the firing hand on our SBR's and keep all hits within a 8.5x11" piece of paper at 10 yds. Muzzle blast was minimal, even to the sides (great benefit for team movements) unlike most other comps (PWS, Surefire, etc). It has the same rings on the back as a standard A2 so Gemtech HALOs will fit as well. I'll write up more and post picts and video later...