Also have now had a session on the 2014 17m Edge, switching between raceboard, twintip and surfboard and I really like it!
The differences between the 2014 and 2013 Edge are similar to that of the 10m above. I found in really light wind the kite to be more stable and a smoother power delivery than previous years, in essence less input needed to fly in in the marginal winds. This also lead to easier tacking, both on the surfboard and raceboard. Plenty of power available on tap.
Another kiter who had never flown a 17m kite was not able to keep his 12m in the sky and was able to get out and back on the 17m Edge - All day the 17m never had to be relaunched