I've personally seen similar units. Not the same as this one...but similar. The first impression I had with them all was....TINY.
Be sure it really will be big enough to accept the sorts of things (plates, pans, etc) that you normally expect to put into it. And be sure your electrical system has the ability to feed it (assuming you're planning on using it off of mains on an inverter).
Yes, I know....all dreadfully obvious concerns. But, people do get fooled by such things fairly frequently I've found.