This is rather pointless, aside from specialized purposes. To be decently useful you need, at a minimum, a screen and a keyboard which you both want to be pretty hefty for reasons of comfort. Unless you are sure you will have both anywhere you go (an unlikely contingency) you need to take them with you, and the best way to take such a device with you is as part of a laptop which is also more powerful and a vastly more mature technology.
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