I think the main problem with all these little gadgets is, that there is no way to make a device that small really useable using convetnional controls.
You need two hands to use the stylus on the SE smartphones...and try that on the train...you'll never hit whata you're aiming at.
You'll need really revolutionary controls to make these devices useful...but don't ask me how that could be done...direct mind-control or something.
Any kind of input is very cumbersome for most mobile devices these days...
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