I'm happy with my XP3s (I have 3 of them). They are the best bang for your buck. I've heard some people say that Eheim's are quieter, but my XP3's are pretty quiet. An Eheim may last a little longer (better quality) and be slightly quieter, but I don't think it's worth the extra money. You can buy four XP3's for the price of 1 Eheim PRO III 2180.