Re: @Richard 12: Note on Windows 8
@Dave 126 for me it is the convenience of just having one device. Full stop, end of story. If I am working at my desk and go out, I grab the Surface and all of the data is there already, nothing to sync, no app incompatibilities etc. And when I get back, I plug it back into the dock and carry on. My notes from the trip are in OneNote in one window on one screen and I type up my report on the other.
Simple, no fuss, no muss, no problems with syncing data before starting to work. No worrying about not having the relevant app installed on one device or another.