I don't want to completely hijack this thread to discuss the Skimz, but it's very quiet. I previously had been using an I-Tech 200 with Tunze hydrofoamer and a Tunze 9010. The Skimz is on par with those, if not quieter. I'm very noise conscious and have a very quiet tank. The pump was one of the big question marks for me. It's an Eden pump - made in Italy. They are apparently an OEM for some of the Eheim pumps. It feels very solid. Micro-bubbles are kept to a very minimum thanks to the design of the outflow under the pump. I need to clean the glass on my sump so I can see better.
Also, I should point out, you can buy these directly from Michael at AquaDigital (an RC sponsor). He is the North American distributor. I think the only other retailer is AquaCave and Michael had a much better deal. You can PM me for more info.