i have 2 mp40w and i love them, i like the clean look, no cord, i can hide them behind rocks, theay are easy to clean, great customer support, no heat is transmited to the tank, have great flow settings (reefcrest, wave, pulse, etc), they can be upgraded, they can comunicate (wireless) with each other to create random flow, i really cant grasp why people are selling them, OHH maybe to pay rent or bills, because they are expensive and if their tanks are shut down this powerheads are the first to go, IMO
sana