I don't have one but I'd like to talk about them too. As far as I know, it has several advantages over wet/dry filters. The media (sand) has more surface area and the water flows around all of it, allowing bacteria to colonize the complete surface area, compared to traditional wet/dry media wich often has spots that the water never reaches. Also, according to what I've read, the FBF never needs cleaning. There must be disadvantages as well but I guess I have to do some more research.