For writing on the go, until now I haven't found any tool I like better than a Dana Alphasmart. It's instant-on and instant-off, it has a grown up keyboard, and it doesn't get hot on my lap. For me, that weighs up against the small dark monochrome screen and having to convert texts to the .pdb-format (I like working in Wordsmith).
This Foleo could be the improved writing tool Alphasmart hasn't made yet. Maybe I'll have to pick one up fast before they flop.