Had a look at a few tablets, mostly ones that are brought to me by owners who want it repaired. That's what makes me avoid them, if they play up/die, they are uneconomic to repair most times. Much rather stick to me little laptop, at least I can take it apart and fix it if required. Chucking a $400 purchase in the bin goes against me little Scots heart.
I use an Acer Aspire One for astronomy, has Win7 installed, runs anything I want to throw at it, gives me 4 hours+ running on battery, and is no bigger than a 10" tablet, with the added advantage of a real keyboard.
Might end up with a tablet eventually, but, "Not today"