Here Here...
I am an Aussie (who would have thought with my nickname) and buying online was a hassle free experience.
It was my first game download purchase, which I was driven to do because I just couldn't wait to play this game till our release date. (They delay for the bank to setup my debit card was intolerable!).
I did not have any problem at all. Other than not having a shiny manual to put up on my shelf with the rest of my handbooks, it is no difference. Though, given the swift patch releases i've been seeing (3 cheers), even if I did have the game handbook in hard-copy, it would have been outdated by now...
So yes, I would suggest to download it. No point in holding off on the goodness you are about to experience...