I have done this jump!
To be honest I've hardly used my new Surface Pro as the Type Cover hasn't been released in the UK yet
But initial impressions after an evening of playing around with it:
Physical aspects are greatly improved. It's mainly the thickness and weight of course, but just generally holding the thing and using it 'like an iPad' really seems to work.
The kickstand was one of the worst things about the first generation, and now it can go to any angle which is so damn helpful! I used to really struggle using this thing in bed, but no more, yay.
No fans! In the last year or so my original model Surface has been going crazy on the fans, so it's nice to not have to bother with them any more.
Hopefully I can add to this another time, when the damn keyboard turns up!