I've had one for a number of years now, and it has been a great purchase for my 90 gallon. It does have flow adjustment like the other Fluvals. I do find that I like the drain - fairly handy. The lid design is also quite solid - I've had no issues with it. I also own a couple of G6 filters as well as some smaller Eheim classics. What's nice is that even though the FX5 is pretty good sized, it's still very quiet. My smaller Eheim classics are the quietest I own, but they are moving nowhere near the same amount of water. You will need to have plenty of space for the FX5 as in my 90 stand, it takes up a good portion of the one side. Also, filled with water, you'll want to lift with your legs as it is a bit heavy. I'm quite pleased with mine. If I had another large tank, I wouldn't hesitate to get another FX5. Personally, I'd get the FX6 if I was getting another one, but that's just because I like to buy the latest - its no sleight to the FX5.
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