I think it is pretty much replaced by genisis atties and various carto tank versions. But, it still beats the average bottom feeder setup.
Well I think carto's suck. People have been sticking them in the wrong kind of tank. They should be going in the tank in the bathroom. They are crap.
I do think the plethora of tanks probably led to this things loss of popularity, and that is sad, since not one of them has made a good atomizer tank. I got the Scubagen, will be getting the DSU, and the Mark-T, but this thing fills a different need.