I've done the buckets, and I think Waterfarm is excellent for the person that doesn't want to build his own. I also believe Waterfarm is DWC. Due to its system of pumping the air down into the bottom of the bucket into the pipe that brings nutes up to the plant, all the water that the plant gets is exceptionally well oxygenated. The only drawback it has is the fact that you have all of your nutes all in 4 gal buckets. That, in the summer, tends to bring the nutes temperature up higher than I like, compared to having just one say 50 gal reservoir, which might be run once every 4 hrs and then returned back to the reservoir.... possibly even outside the growroom.

spaceneedle