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.
I'd rather be "better" than "right"!
"Humility is the clearest indication of strength". Sure wish I was humble!
Ultimately, experience is the best teacher.