Yes, I have a biofilter hooked up to my 45 gallon in the basement (the test tank with soil substrate). I had it from my old salt, fish-only tank. I was never very succesful with salt, so gave it up long ago.
I really dont think it is any better than a cannister filter, and here's why. It is hooked up to an overflow type device in the tank, which only extracts from the surface. All mulm still sinks to the bottom, so you still have to vacuum. Also, the air and water are constantly being mixed, which you are supposed to avoid with a planted tank, as id drives off the CO2
that is in the water, leaving plants with very little.
Well, it is easier tio clean the filter material than a cannister, and it does look cool, and I think it would be great for a tank with a very heavy fish load. I'm only still using it because I'm spending too much on this other tank right now to buy any more stuff.