This boot definitely nails the mid-stiffness I was going for! The flex is great for me (5'10", 145lb), especially skiing backcountry and powder. They are definitely narrow though, as they are one of the few boots that isn't too wide for me.
What surprised me the most was that after a season of running around parking lots and villages, the rubber soles still look brand new. No difference bootpacking with them, but I no longer have to tip toe across any hard ground.
Overall, this is the most comfortable boot I've owned. It hugs my foot perfectly, and I have not had any shin or toe bang from them whatsoever. Definitely recommend.