I know that product, well... the 5-15 model actually. It's a very good cartridge style filter, much like the Marineland Penguins. As a matter of fact, Aquatech is made by the same manufactorer, and you can use the Penguin cartridges in the Aquatech ones, and vice versa, you just have to find the right size.
Also, you can modify them w/ bio-wheels just like the Penguins, just have to order the parts. I used it since May 04' and just stopped less than 1 month ago, because I got a Aquaclear 200. Cartridges hardly need changing, washing it in tank water once in a while will do. Also, you can cut the cartridges and stuff em' with more carbon or some other media.
The thing primes by itself, but is noisy until it does so, and it takes some time. Much more than I can say about the Penguins though.

And it's quite silent, I had it less than 5 feet away from where I sleep, and I could hardly hear it. Then again, I like to sleep with some music on, so
HTH.