It'll be interesting to see how you find the cassette.
I'm having a bit of a love hate relationship with the set up. I love the smoothness and quality of shift and use, but I'm finding the leaps between the gear range, a bit excessive for my use and it somehow doesn't quiet work. This is only noticeable on down shift, when you go from a gear that slightly overly high, to the next one down that then has you spinning. It can become a slight irritation at times, as it is sort of a juggling act to get things right.
In part, I think that the terrain around my neck of the woods, (average 1,200ft of elevation gain for every 10 miles) just isn't steep enough to warrant the range of gears. In the alps though, I don't think that it could be bettered, and I'm certain that it would come into it's own.
Riding unassisted is just so effortlessly easy to do, and if you were ever left with a flat battery, it would be no real effort to just carry on.