I loved a lot of what I saw with the Duo but thinking about how practical living with it day to day my thoughts are:
- That spine/hinge isn't protected by cases (at least Apple's anyway). When it's closed and sliding in and out of pockets, being put down etc many people are going to scratch it, no matter how careful you are.
- How often are you really going to be out in public, open the phone up to it's full size and using it two handed? I mean if you're sat down somewhere then fine but taking it out and opening it and having to hold it with two hands doesn't feel like something I'm going to do often.
- People are going to know it's a $2k+ device simply by its form factor, so potentially a bigger target for thieves.
- Using it when it's closed to make phone calls looks a little...silly? Holding a small, non-candybar shape phone.
- Apple have talked a lot about how complex it is with "100 moving parts" in the hinge, then there's the issue of the crease (Apple haven't provided a number of fold cycles it can tolerate). There might not be any problems at all, but it's a first gen device so who knows.
I know they're not major problems, and don't get me wrong I love so much about it, but they're the things that are stopping me pulling the trigger on a purchase.
Will probably be very envious when I see one for real out in the wild.