I like them for the increased, highly oxygenated surface area for the benificial bacteria to grow on. I've had one for years and have just bought two new systems for some of my other tanks. I'm stuck using an UGF in a twenty, tall tank in one of the classrooms that I take care of and stock. The tank is not mine and the filter, powerhead and air pump all came with it. I don't feel like setting it up out of my own pocket other then stocking it with babies and overflow from other tanks. In a way it's a good thing that I vacate that tank when school is off for the summer as it gives me a chance to give it a real cleaning and start a fresh in the fall. The fish get adopted out at school end except for perhaps a few favorite.
ALASKA