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Well I dont know why but I may (or may not) be the only person to have a bad experience with ehiem...but what I know is I have a few Rena XPs and I love them to death they work like a charm! Gets my vote!
I have been using a Marineland Magnum 350 with dual biowheels for 5 years and it works great and is vitually silent. You can't hear it unless you open the door.