They were displaying those those on a tank at MACNA in Sept. They put out alot of flow, the tank they had them in was empty (except for water of course) and they had alot of little plastic pellets in it that would get blown all over the place so you could see the kind of flow they put out. They were signing up BETA testers but I declined not wanting to spend $250-$300 to test one. I really like the idea that the part that produces heat is on the outside of the tank plus the way it is kinda like a cleaning magnet it doesn't have suction cups or bulky brackets to hold it up. The way it looked I wouldn't think they would be suitable in a nano (they were pretty big) but they would be a great addition to a larger tank, especially an SPS tank where alot of flow is needed.