Boz, I agree entirely! My Advent gives about 3 hours continous use on its own battery; with entertainment on my 1hr each way train journey, plus use during the day as a presentation device and general reference tool I was needing to choose between carrying the power brick or using the device sparingly. The U2o has removed that restriction at a stroke and also succeeded in charging my Diamond and Ameo as well!
That sounds a bit sad doesn't it! Carrying an Ameo, the Diamond and the Advent all at the same time
Lets just say I'm starting to rationalise my mobile computing requirements, and the U2o may just influence my final decision !