I scared that 1 wrong move or huge crash and this frame will break. But for all normal xc trails this bike will last a long time, and keep you happy. You don't have to race to appreciate the killer handling this bike offers, but you do have to be ready for the sucking sound in your bank account. The extra hit you will take swapping out the Shimano WH M535 wheelset for something more easily servicable tends to crank the price tag up rather more than necessary. Since price probably isn't an issue if you're buying this bike, the performance is worth it.
Light weight makes a huge difference hopping trail obstacles.
Downhill experiences are less comfortable than climbs, where the light weight trades off into a tendency to bounce easily off rocks and roots. I have not yet felt comfortable sitting back and letting the bike carve turns, still need to steer actively and pick careful lines.