I've probably had most of the Ipod's that came out. The switch from the Ipod touch to the Ipad was just seemless because of the similarities in both produts. In that respect I think Apple does a pretty good job in making their products usuable for the customers.
I recently went on a business trip and left my macbook at home and only carried the Ipad. At first I was a bit apprehensive but I never missed an email, always could open my spreadsheets, word documents and adobe pdf files. Even file transfers from the camera to the Ipad were seemless with the camera adapter kit. I use Dropbox for my files so the memory sticks and cd's are a thing of the past.
Awesome product in short.