I plan on using the surface for quite a few different tasks. First and most importantly it will solve the problem of having to carry my notebook and iPad with me!
I used my iPad for the following -
Note taking.
PDF reading/review
Site CAD (not sure what app I can use for this)
Email
Web
Music
Misc. apps...
For all intents and purposes the iPad has served me very well over the years. However; I think the Surface platform will suit me well. I've really been working with Onenote; which I think is a great piece of software...