It is important to remember that as far as i know Eheim is the only company who rates their filters full of media, so you are actually getting what is says you are. Simplicity is what makes these filters great, I love mine!
ive had a 2217 for mayby 4-5 months and its so quiet. Like said above it may seem like thwy have a low flow rater but it is compareable to other filters since it is rated with media wile others are not.
Gotta love the very simplistic and foolproof design.