Anyone who has a smartphone is carrying a little box of compromises. A Swiss Army knife of compromises in the name of convenience.
There's no way I'm carrying around a;
Torch, and yes it's a torch much better than most torches I'm given as a "better" torch. Isn't it TB...?

Web Brouser
Email
Text
Phone
Cam corder
Camera
Weather station
Compass
Calculator
Games
Books
Music player
Video player
Etc etc etc
Why would somebody not want an e reader added to that list at the flip of a device? Be it a tablet, smartphone or whatever? Ok, Kevin Wood wouldn't as he hates mobile phones. But if your going to invent a new aspect to mobile technology, a mobile phone is going to offer the best market to get started in. Tablets cam come later.
As said in the video, the battery life in conjunction with a power saving screen can give the owner another dimension in mobility he or she can use as required. If near a charge point obviously the LCD screen is preferred. If no power available, use the eink job.
Where's the loss?

it's a win win. Rare thing in life ime. Cost dependent if course.
I suppose the only way to improve that duel screen design is to be able to view both from one side. If LCD could be made completely transparent somehow, to be able to view the eink underneath...? Probably not possible currently, as they'd have done that instead.
Anyway, thisis the mobile device market we're talking about. Not for everyone, true enough.
