Nemofish, honestly the PFO's are the only MH reflectors I've had experience with, so I have nothing to compare them to. But FWIW I think they are great. They spread out the light fairly well, and are very bright. I have 2 over my 4' long tank, about 8 inches above the water and there are no dark spots at all. Standing back and looking at the tank there isn't any noticable scatter, it's all going down into the tank. I have heard that the lumenarc reflectors are pretty much the best on the market these days, I have no experience with them though. HTH