Don't waste your money on one of those cabs. With two weeks of research you could make your own for way less than a thousand.
For the 1500 to 2000 bucks they charge you could make two grow rooms or hell even two cabs. One for vegging and one for fruiting. That way you could have mother plants, clones, and have a vegging crop while you have a fruiting crop. This speeds things up a bit.
Personally though I only hear mixed things about sunlight shed grow cabs. I imagine its very much so dependent on who puts together the cab at the factory or it's just super newbis totally excited about their 2 grand cab that they overly hype them up. However a lot of complaints I've heard about those cabs is that they either over heat pretty easily and that they leak light like crazy. Neither of which is good for growing. Also no way in hell are you going to grow three lbs a harvest off that thing. I'd say at max you'll get a 1/2 lb maybe a lb (the later being very optimistic). Seriously there is no way you could fill all those grow sights in that hydro setup with plants. At most you could fit 1-3 decently sized plants in that. Or a double that amount in little plants. Also you still need to keep that cab close to a window/have duct work running to it to bring in fresh air. Otherwise things can mold, you plants won't grow as well ect... Personally though I say save your money and build your own setup. If you do that you'll have a setup 300 times better than that shit.
The only parts you really need to make a cab like that is...
1. A cab (they sell plastic rubbermaid cabs at home depot and metal ones too! and that's what sunshed uses for one of their models) or a grow tent (cabs are actually cheaper).
2. A res ( a 25 gal or less DWC system would be fine or you could make a drip system personally though for a cab like that I'd do a DWC as I imagine it would be hard as hell to get that liquid to return back to the res).
3. PC Fans (circulate air)
4. A Inline fan to take out hot air (I'd personally attach that to a cool tube lighting system) and another fan to bring in fresh air.
5. A digital ballast+bulbs+wires+reflector (I'd get a cool tube reflector) I also would use anything over 400ws as I could see that fucker getting real toasty otherwise.
6. Timers+extension cords
7. A CO2 canister+cylinoid (Optional but needed if you don't have an intake/exhaust fan)
8. Mylar reflection material (optional once again)
And thats really all you need.
I bet I could but together a bitchin cab system in less than 12 hours (that includes driving around for stuff, but not including the amount of time it would take to get the HID system shipped off of ebay)