you will likely get mostly posivitve opinions on this filter, but i dont like them much. they are good for mechanical and chemical (which many people dont use, including myself) but thats about it. i actually had the mag 350 and i sold it to a friend within a month.
problems? no biological filtration, crappy plastic hose connection rings, crappy little plastic thing that holds the intake/outake to the back of the tank, crappy outlet pipe within the actual filter that i actually "bent" while trying to seal the O-ring...
everyone seems to love these though, so you have to decide for yourself. i would go with an eheim or even a fluval before one of these plastic beasts.
M