I have never used a downdraft type skimmer, but I have been using an Aquamedic Turbofloater 1000 (Rio2100 with a needle wheel) for 4+ years. The Turbofloater is easy to tune for a wet or dry skimmate. Mine produces almost a full skimmer cup full every day of dark smelly skimmate. The pump only uses 18 watts of power. As far as using a Rio pump, I have to change the impeller (not the needle wheel) once a year due to wear. This is what I have found to be the weak link with Rios. The rest of the pump is 4 years old.