That system looks like a ripoff for the $1000 you say it costs. You could build it for $500 or less, no problem. Probably far less. Look around on this board to learn how to build hydro setups and stealth grow cabs.

As for how much to expect off the grow, don't expect anything off the first one or two grows. Chances are you'll get a little, but there's also a reasonable chance that you'll mess it up while learning how to grow the plants. I figure, the lower your expectations, the less chance you have of being disappointed.