I tried the ipad mini, and it just didn't see enough usage cases for me, probably because it was a second device i had to bring with me, where my phone was ALWAYS with me anyway. This basically solves that problem because its *almost* a folded ipad mini with an iphone up front. I could see myself using the front 75% of the time and then using it unfolded for watching videos, maybe even multi tasking some.
I think there's a lot of potential value here and something that, if polished just a bit more, could really be the first real disruption to smartphones since the iphone.
For my use, I'd need to see how a case fits into the equation too. I cant see myself rocking $1800 in my pocket with no level of protection, especially since I tend to keep my devices 4-5 years.