I know what I'm going to use it for.
I work on an open source project and I've just submitted a patch. Tomorrow, I'm travelling to go spend a week with my parents, away from home. I don't plan on taking my laptop with me, but I want to follow up on my patch. Reviews are probably going to ask for minor changes.
Basically, I can see myself using something like this when I'm on the move. I'm not a big fan of dragging my laptop with me everywhere I go...