The Whisper 10 filters are the ones that come with most of the Mini Bow 2.5 and 5 gallon tanks. It also came with my 5 gallon hex tank. I haven't had any problems with them at all other than if the filter pack gets a little dirty, some of the water tends to go out the back and sides of the filter rather than the front. That's not really a problem though since the water is still passing through/across the filter pack.
Edit: One other thing: those filters hook on the side of the tank with a small hanger. It isn't very big so may not work depending on the thickness of the top of the tank. I think the hangers on my 10s will go over about a 1/2" lip.