It's not very good marketing if the official response arrives later than the informal one
By the way, I have no problem with the battery life - be it 3 or 8 hours (definitely not going to be 21!) - it's just sad that currently the iRex is not value for money, and whereas I would gladly pay 200 pounds for it (to use it as a toy), I will never going to cash out 400-500 pounds under these circumstances, when you can be sure that you run out of battery exactly when you would need it, e.g. on a business trip or at a presentation, and honestly I wouldn't switch it on/off every minute just to save power, by the time the system has started my customer would have left the room.
I'm so sorry, because I wanted to support them with my money, but if my sony can run for 2-3 weeks with a charge then I would have expected at least 70 hours from a professional business tool (again don't compare with a laptop - the screen uses 0 power to show a constant image, I don't care what mobile phones or PDAs are doing, this supposed to replace paper).