They are great quality filters. The water is crystal clear and the unit is SO quiet. I had the 1000 on an overstocked 55 gal
tank full of Cichlids and the water quality was perfect. And that was doing water changes once every two weeks. Plus, I like the look of the Cascade over the others. The input and output tubes don't look so industrialized. They are black and very easy to hide. Thanks Hoover for agreeing with me. I just wish everyone would give them a chance. I know, I haven't personally used the other ones, but that's just because of the look of them. I have friends who use the others and they just aren't as attractive in the tank. But, thats just my opinion.