guess i seem to be the only one that DOESN'T like them, biowheel filters were my first filters and i hated it, mine sent the water underneath the bio wheel, which then inturned made the fins move, when the bio-wheel got enough of a bacteria colony on it or if muck got on it, the wheel would stop moving, i was constantly cleaning it Just the muck off the spindles to get it to move again. I've since moved to aquaclear hob filters and i love them, no problems what so ever, and a huge huge basket for media. OH that was the other thing about the Biowheel filters, the filter pads would always get some kind of slime build up on them it was so gross lol.
Also with the aquaclear filters since the media basket is so big, i have two extra bags of ceramic chips in thier to get more bacteria built up for the next tank that im doing, that way once i have the tank i can just move the bags over and voila instant cycle.