Joe, the reason I am asking is because I'm not convinced about the flow rates.
I had a fluval 404, and a few eheim canisters.
The eheim classic 2215 has a flow rate of 620 l/ph and the 404 has an alleged flow rate of 1200 or 1300 litres per hour. I swear down, the eheim had a stronger flow, even though it was meant to be half as much. The fluval also clogged easily and the flow dropped significantly, I had to clean it often, and I never cleaned the eheim.
SO that's why I would like to do a test.
If the FX5 really does have a significantly higher flowrate, I might change my mind about fluval.
koliveira - in my experience eheims are not overrated at all. In Europe they are roughly the same price as fluvals, and I have found them to be the best filters, hands down.