There are different applications that different filters are better for. For a tank with a bunch of big, messy fish, you're looking at something with a lot of flow, like a Fluval FX5 or a sump and good mechanical filtration, and biological tends to take a bit of a back seat, as you're probably doing water changes every few days anyway.
If you're keeping a lot of smaller fish that are sensitive to changes in water quality, the exceptional bio-filtration of Eheim is the way to go(although I use Eheims for almost all my tanks).
Someone before... can't remember who, said it right... we're comparing apples to oranges here. Eheim has its strengths (bio-capacity, efficiency, durability), and other filters have their strengths (stong flow, convenience, etc). While Eheim doesn't have a big high flow motor to begin with, even as the filter begins to become clogged, the flow rate doesn't suffer, whereas the effects tend to be more drastic w/ other cans.
Bottom line: With Eheim, you get what you pay for: a great filter.
EDIT: I think Eheim should be slippin' me a little somethin' under the table for my kind words...
If you're keeping a lot of smaller fish that are sensitive to changes in water quality, the exceptional bio-filtration of Eheim is the way to go(although I use Eheims for almost all my tanks).
Someone before... can't remember who, said it right... we're comparing apples to oranges here. Eheim has its strengths (bio-capacity, efficiency, durability), and other filters have their strengths (stong flow, convenience, etc). While Eheim doesn't have a big high flow motor to begin with, even as the filter begins to become clogged, the flow rate doesn't suffer, whereas the effects tend to be more drastic w/ other cans.
Bottom line: With Eheim, you get what you pay for: a great filter.
EDIT: I think Eheim should be slippin' me a little somethin' under the table for my kind words...


