Having just purchased a new computer for a friend with Vista pre-installed and a Win 7 upgrade option, for anyone in our area I would say “Don’t do it!”.
The reason is that the upgrade DVD is sent by air out of Singapore using DHL SG as the courier. No problem with that part, done promptly virtually overnight in spite of the flood of orders, but after it arrived at Sydney airport it then took a week to be delivered to Central Mangrove! DHL SG use a third-party courier (no name given) for delivery to outlying areas and that courier only delivers twice a week: others provide a daily service
I have suggested to DHL SG that they change their arrangements for final delivery to country areas in NSW but I doubt if that is going to happen in a hurry – if ever!