I could see myself buying this on one condition: absolutely zero lag. If I move the stylus and then watch it fill in after me, I'm not buying. Otherwise (especially with the possibility of solar power), I might buy.
I wonder if, since I believe the little e-ink bubbles are magnetized, you could use a magnetic tip stylus to "override" the current state. Ostensibly you could use the same tech that turns he bubbles to read their state. That would give you zero lag, pixel perfect line recognition.
