I use this on my 10 gallon and 2.5 gallon tanks. Keeps water moving and the charcoal packets are easy to use. Reusable foam filter makes a nice filter package. Variable water flow makes for easy adjustment for small tanks. You never have too much filtering.

Pros: Great Power Filter, Very quiet, easy to clean

Cons: none

These little filters are really decent for keeping a 10 gallon tank pretty darn clean. They're a very quiet filter that only rarely give you any sort of problem,and that's usually just a sign that you need to rinse out your sponge filter.A very reliable little filter.

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[updated on 2008-10-18 13:51:49 GMT]:
I also wanted to add that the Aquaclears are very quiet filters.I have a lot of tanks running,and some are in my bedroom,so the noise factor for me,is important.

Pros: easy to find works great

Cons: none

Works well - easy to use. Needs longer tubes for big tanks. Sometimes need to jump start the filter.

Pros: Easy Use

Cons: none

I use one on my ten gal.easy to use.great price.easy to change media

Pros: great for small tanks

Cons: none