i have seen this company's tanks in person in kansas city where I am originally from, the ecowheels owners dad owns a petstore and runs them, they are kind of cool, but they leave a lot of dead spots in the tanks from my experience, they have great luck w/sponges and gorgonians, but they also had bad algae outbreaks when I have been there. They claim that they skim because of the bubble and the turf scrubber but I don't personally believe that, the toxins would be reintroduced in a matter of seconds to the water column as it moves. I just like the surge effect that it presents.
If you run one you would definitely want to run powerheads in your tank. If anyone attempts or attempted a DIY I would be interested in checking out the link, it seems with the right modifications it could be far more effective