Has anybody tried these out yet...they certainly look like a cheaper alternative to those Tunze's and at that price who could resist. I think I'm gonna dump my powerheads for these[url=http://www.drsfostersmith.com/product/Prod_Display.cfm?pcatid=15955&inm=1&N=2004+22788+2035]Water Pumps & Wavemakers: Hydor Koralia Water Circulation Pump[/url]