I have the SM HOG1 for about a month and a half now. Its really not growing anything at all, but I think its more due to the fact that I have ZERO no3 and po4. I don't have to clean glass often at all, and have no algae growing anywhere. I think if you want to buy a pre-built, you either go with a SM unit, or a Floyd unit. I think Floyds will likely grow a bit better since its a water fall design, but it also takes up more space, is more difficult to install, and more expensive.