In case you hadnt heard Microsoft have just released iPad versions of Word, PPt and Excel... the app is free but you have to subscribe to Office365
Working in HE I managed to get 4 years for £59.. and I have to say its superb...
I've been unable to use an iPad (with keyboard) for anything other than emailing and the odd photo edit - work wise - as most of my writing involves collaborative track changes style editing in word (sorry google docs doesnt cut it for this). But this adaptation of Word is brilliant. Save on iPad or skydrive. I was thinking of getting some sort of W8.1 tablet combo ultrabook thing but no need now.
Very pleased.