I mucked around with the bio flos on my return lines when I setup my new tank, I wasn't really impressed. I found them difficult to attach to the pvc and they blocked a lot of light. I also broke one of them somehow, broke a tooth off one of the gears, I have no idea how.
However in my 12 gal I stuck one on the end of my powerhead because my anemone wouldn't settle down. It takes up a big amount of space still but it did get the anemone to relax.
I don't think I'd recommend them to most people though, by the time you get a maxijet and the flo you are about $5 shy of a sieo and have nowhere as useful. That wide output on the sieo is very effective.
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