My phone has a 6 inch screen and it's perfectly functional as a phablet as it is, this hinged design looks like a great way to break a phone in half, just either get a small smart phone or a phablet if you want one.
This looks like it fills a gap in the market which just doesn't exist tbh.
Why not check me out on youtube and help me on the way to 2k subs over at www.youtube.com/stormcloudlive