Hello 1Grow. I have the same system you're looking at. Obviously the people in here offering their opinions have never used one, let alone seen one. First off, they DO come fully assembled. Arrives as you see in the picture, which doesn't do it justice I might add.
The price is quite reasonable in my opinion. It comes with a lot more than a light, fan, and a box. Take a look at their site where it tells you what it comes with. The box is high quality from top to bottom as well. It comes with a Botanicare turbo garden that retails alone for $350. I have the same power strip that came with the box that I use for my aquarium and I paid $70+ shipping for it. Even the cabinet itself has to cost at least $500. People in here tend to think if you didn't build it with your own hands, it's not worth anything. Here's some food for thought; they'll call you a fool for buying one off the shelf. I work full time and for me to build one of these it would take about 6-8 weeks to do it right. By that time I had received my box and was 3/4 of the way done with my first grow...the yield from which paid for the system in whole (actually, it paid for the second one I bought... yes, have two of them now if that says anything about my opinion of the value).
I can tell you that I'm a handy guy, with a fair tool chest, and if I built one of these it wouldn't come out near as nice. Especially my first try. They paid a lot of attention to detail and it shows. I'd go as far as to say that it was better than I expected to receive.
As for the stealth factor, I live right next door to a cop. My garage faces his garage/front door. I have mine open quite a bit and even find myself talking to him in my driveway just feet from the boxes. He has NO IDEA! Try doing that with a fucking tent! Smell is non-existent, no light leak, and it's quiet as hell. Oh and it locks up nice and tight.
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Ask away if you have any questions. I haven't documented a grow yet, but thought these pictures might benefit you. FYI, I hung the string in the box to hang my buds from only to realize that I could have used the trellis that came with it. Live and learn I guess.