re-edit: Come to think about it, I've got another reason to be reluctant about the iPad/iPhone platform. I've found that those can get quite distracting while gaming. In my turn, I'd have opponents check their email, or download the latest movie trailer "just to show me...", etc... I've asked this opponent (which is my best friend!) to cut back on iStuff use while gaming.
I had a friend doing that. He was looking up 40k related things and we had several players but if he wasn't rolling he was surfing. Annoying.