I got a Cascade 200 a couple months ago at an LFS, I like trying different brands - I've had Bio Wheels, Whisper, Aquaclear etc as well...
It is an ok filter but not great, when I first powered it up I thought it was broken. It took quite some time to fire up, I had to tap the filter around and remove and insert the impeller quite a few times. Once it fired up it started moving some water well though. The media it came with I still have it in but I am about to replace it all, it clogged up uber fast and caused the water to start pouring back over the intake area. Also the little Bio Falls system, it is neat but not super effective. When you remove it the filter output is nice and powerful but in place it makes very little water movement. It also restricts flow some because even more water pours over the intake area. I simply clipped it in half or so, this way some water passes through it but it doesn't restrict flow and it allows more water movement. I likely wouldn't get another but it's not horrible, just not great.