I will second Eric, Eheim and Rena are considered better value than Fluval from the information I have come across. Eheim have proven track records; many believe they are the best made filters. Rena have not been around as long so it is still uncertain how they will stand up by comparison, so they may be equally good, no one knows. Their performance is certainly good. I bought a Rena XP3 last summer, and I have Eheims on my other two tanks which have been running for more than 12 years without a hitch.