The Spark is very nice. I just sold mine!
It was honestly a 'do everything' type of bike. It weighed 9.3kgs yet had 110mm of travel. Madness.
The DT forks were ok, but very flexy. They were also a bit sticky too. They looked great, but one light 'lay-down' of the bike in a corner (damn maxxis tyres) and the carbon legs were scratched.
Its very interesting to see that they seem to have ditched the integrated seatmast design (also noticed that the Columbia Scott road frames in the TdF are not integrated either) - it must be due to how much of a pain in the ar$e it is to fit them in a bike box/bag for travel.
I had a large, and needed to take the chainset off every trip, and even then needed a huge (actually the biggest, and consequently heaviest) bike box.
The Spark was the nicest XC bike I have ridden, by a mile.