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Get a couple media cages and make your own cartridges. The stock Marineland cartridges plug up quickly and they don't rinse out very well. Otherwise it's a good filter if you keep sand out of it.
I have 3 Marineland Penguin Filters (1 250 bio-wheel on my 29 gallon tank and 2 350's on my 60 gallon tank). I really like them. I'm still using the media cartridges that cam with them, but I plan on changing them as BigJim indicated.