I finally broke down and dished out the cash for the Battlecomp 1.0 & I've been using it on a couple ARs for a few month now and here's what I've found:
-Very good muzzle control during rapid fire strings.
-Minimal flash signature (see video for the night shooting). Similar to A2; perhaps slighly more but not much.
-Minimal side blast.
-Machined stainless steel with a black oxide finish. It's holding up quite well.
-Crush washer included (it just annoys me when they're not...)
-Carbon doesn't seem to build up in any one spot on it so it requires minimal cleaning.
-Cost. It sells for around $120 +/- $15
Here's a video with some day and night shooting, a discussion of specs and my overall thoughts on the brake: