Aquaclear 500 7 years nothing but mediaBought an Aquaclear 110, 2 years ago. It finally kicked the dust. During that time i went through 6 impellers and 18 impeller shafts. {This is with the intake strainer 6 inches below the surface. Most expensive filter I have ever owned.
My emperor 400 bought at the same time has needed nothing but media.
Rena xp3 has been going since 2008 been through 3 moves and some rough handling never once gave me trouble. Actually just ordered 2 more.
CFS 500 is has never given me any trouble in two years either