Wow you guys weren't kidding about the res being hard to bleed. It took me about 6 hours to get rid of the majority of air and 2 days running nonstop to quiet down I really wish that I had gotten a newer revision as I have the first one. It sucks that retailers are still selling the original one. Got mine Monday and was unhappy when I saw that it was the old one. Only option I had was to eat shipping costs to return it plus 20% restocking fee