Sure, it'd be nice if it was insulated, but you are never going to find an insulated cabinet smoker with 4+ shelves for 400.
I think it's a unique and good design, from what we can see. It seems pretty well built, and as stated above, you could barely build it yourself for that price. I like it.
If it were me, I'd go look at it. I'd want to fire up a tiny fire and wood to see how tight the doors/etc are. If it leaked like a file cabinet I'd be out, but if it was reasonably tight, I'd buy it.
I think a food cook can make food taste good on just about any cooker with a little practice. But the most important thing is being able to control temp. So if it's not a leaky mess you should be good to go!