I cant speak from any experience with the BM. BUT, it looks like a very sweet skimmer. Very well built I'm sure as it's an ATI product. It has the SAME EXACT Sicce pump as do the Octopus Extremes and their twin, the MSX Extremes. Reaction chamber diameter looks to be the same. Really very similar all around. Except the ATI has a slick built in gate valve, the octos and MSX have a twist pipe design. Which seems to be effective. HOWEVER!!! The ATI's are about twice as expensive as the others. And you could get the gave valve mod for 35 bucks i think it is. So..... the ATI IS a sweet skimmer, no doubt. But but you'll pay for it also. If you have the money then go for it. If you don't, then elect for the others, you wont be able to tell the difference anyway.