Low res 24" monitor the size of a CRT for $500? I like the concept but I don't think I could justify buying one of these even if it were $100, and I love wasting money on this kind of stuff.
I get the portability aspect of it, but in order to use it like a computer you'd still need a keyboard and mouse, and if you're carrying all of that around, why not just carry a laptop or a tablet?
The only real use I see for this is for giving presentations on the road where you won't have access to a real monitor or projector, or maybe it would come in handy for a field tech. It seems like the idea is just too far ahead of the technology, especially considering the price.
That all said, it's getting a lot of backing so maybe the average person sees a lot more utility in it than I do.