Shot the AR with the Miculek compensator last night.
Pros: The compensator did a truly remarkable job of mitigating recoil and muzzle rise. With the original A2 birdcage FH, the rifle would "bobble" and recoil slightly with each discharge; with the Miculek compensator, I did not notice any perceivable movement with each shot. In fact, when shot offhand (i.e., not benchrested), there was almost no recovery required to bring the red dot back on target between discharges. Truly amazing!
Cons: Equally amazing was the noise level. Yes, this compensator is loud. Very loud. Very, very loud. The sharp crack of the report made it through two layers of hearing protection (plugs and muffs) and was starting to give me a headache after about 40 rounds. The shooting stall had partitions on both sides, which probably exacerbated the noise problem and also caused the lateral blast from the compensator's ports to blow items like target sheets and mousepads off the shooting bench.
I am fairly certain that shooting outdoors will mitigate the noise problem somewhat. If not, I might have to consider reinstalling the A2 birdcage FH to save my ears!