hey alex..
don't know much about the eheim pro II, but here what i do know:
when i was looking for filters (last winter) i considered the eheim pro II but it was very expensive so, i decided to go with eheim 2213 and a large penguin biowheel that i already had for my 55 gal.
the combination of these 2 filters has worked really well. i usually clean the canister basket every couple of months.. very easy.. the 2213 is very very quiet.. i would buy it again..