Origami is still almost a paper project, in that reported battery life is still very much shorter than hoped for. 15 minutes is not going to get you far. By next year, it will most likely be starting to look good. However, the original idea of a cheap and ultra portable device has already been kissed off... $1,000? You could get a good lappy for that.
The only other problem, is that when you look at it, you wonder why they don't just put maybe a keyboard on it that could fold over and protect the screen when not in use... Wondering if you have seen something similar, maybe? (The Bluetooth keyboard idea is good - though of course, you will end up lugging it around with you)
Conan