The last time I was at the range, I had the unfortunate experience of be being forced to sit next a shooter with a muzzlebreak.(this was due to range rules concerning specific firearms, at specific benches).

The only funny part about the situation was the fact that the muzzlebreak was on a blackpowder muzzleloader! This guy claimed it was a "smokebreak" and that it cleared the smoke out of view as soon as the shot was fired.

All I have to say is that everyone in the vicinity was very displeased about being subjected to the blast from this contraption. The only people that gathered around this gun all looked like they wanted get their hands on it...so they could thow it in the woods!