The design is stylish for sure, but I'm not sure this thing works as required. The heating element construction is a neat idea but it really increases the thermal mass a lot. This may not be an issue for heating up but it may prevent the oven from cooling down quickly enough. Here, the fan would be helpful but... what's that? The fan feeds into a tube with a diameter of roughly 1cm? And there is no air outlet, so where does the air go? Surely, the fan can't be sucking out the air... oh wait, it is! So they're feeding very hot air directly into the fan! That's not a design I'm confident in, especially since there's no clear air path to me. The air path may be pretty obstructed, reducing air flow.
In short: heating seems fine but cooling... not so sure. Maybe I'm worrying more about this than is warranted but since I can't test the oven in person, being critical is all I can do