Thanks also for that. I shall have to investigate further; my German us still not as good as I would like but I see no mention of useful information such as battery life, any requirements to register to use it, and compatibility with Calibre. All of my books (except one, bought to see how it worked) are already unencrypted epubs and I have no intention of changing that.
But it does definitely look worth further investigation.
Biting the hand that feeds IT
