I read - and this was the reason I didn't get one - that it is very sensitive to outside temperature changes, because it is uninsulated. I read that even with an insulated sleeve, it was sensitive, and when totally sealed in a box, the temperature was too high. Also, as ksacres said, I read the turner doesn't work all that well.
I was attracted to the round design - I would think that the air circulation would be better in such a shape, and I don't like the idea of styrofoam either, but I ultimately bought a styrofoam little giant.
The styrofoam ones are harder to clean, but I figured that a stable temperature was better than total cleanliness. Also, I figured I could seal the inside of the styrofoam to create a smooth surface to scrub.
The price is the same as an lg or hova - $150.