Climbs Very Well
I did a few long climbs in the Tetons with this pack where we carried our bivy gear in (loaded up the pack) and then left it behind Compressed the crap out of the pack) for the climb. It worked as both an overnight hauler and a summit pack.
The material seems as if it ought to last a good long time though it definitely adds some weight to a "light" pack.
I love the kangaroo pocket, the hidden rope tie down strap, the very capable yet slim hip belt, and the overall comfort of this thing both full and empty. You can feel the ReActive shoulder straps sliding back and forth as you move, but I can't say as whether this feature felt better than a pack with a solid attachment or not.
I'm not a big fan of the axe attachment points however. I bent one of the thin chincy pieces of aluminum and ended up clipping a biner through the loop to ensure I didn't lose my axe while I was climbing. The cord itself is mighty thin. Be careful scraping that stuff up and down the rocks.
Otherwise I would highly recommend this puppy.