ive owned both the sunpower and currently have the powermodule, the reflectors are a little bigger on the pm then the sp, definately not built the same as stated it was a die cast cut aluminum block compared to folded metal, both look good and wouldnt really be much differance if hung over a rimless tank. i like my products built though and the sunpower is more flimsey then the pm. both use junk single core wiring though. when ballast went out on pm i replaced all the wiring with braided wire which has a better conductivity.
if i was to buy new id go with the new tek elite, has 98% reflectors also and now has the fans, and buy extra bulbs and still have $ left in my pocket