It's basically a copy of the Stinkbud system see for yourself. It is part of a perpetual idea proposed by an RIU member and now there is forums and downloads for it.
http://www.stinkbuddies.com/downloads.htm
So you can just go see what the yields are from people using that system there.
Edit: Holy poop! 800 dollars for that system, that is a rude scam man. That system isn't even good as the ones on the site I linked, and those systems are not even close to 800 bucks. Plus all the spare parts are at Home Depot! lol