HP split

[lmmt61]

I am not sure about using small tablets or smart phones for that purpose. It is VERY unconfortable to use any maths program with the soft-keyboard. If the tablet is big enough then it is easier but then again, is BIG and a trouble to move with it.
And finally the bettery life is 10 hours if you are lucky; the charger is a must.
On the other side I agree that new generations like tactile screens and to have whatsapp, facebook and the calculator in the same machine; if the Prime could deal with all that at the same time would have been excellent. I guess!