Hi I really need to be able to edit excel, powerpoint and word documents from my ipad. I have two questions: 1) is iWork good enough to do this properly? Would I be able to, for example, put a powerpoint together from a template quite easily which I could then transfer to my school account via e-mail (I'm a teacher)? 2) can you buy iWork as a complete package for under Â£21?? I can only find the three separate apps for Â£7 each and it seems daft not to sell them together. 3) are there any compatibility issues between iWork and MS Office or could I use them totally interchangeably?