Do you use a mouse and keyboard with the iPad? I've tried to use an Android tablet for anything other than a media player and web browser and everything took far too long (only using a mouse). Even to write a long email I could go downstairs, power-up my computer, type, send, power-off the computer, and return upstairs faster than I could on my tablet.
I do agree tablets are great support tools. For watching videos, music, and email (reading) they are great.