I like the light weight of these boots.  Plus, with heavy smart wool socks, a liner sock and some toe warmers my feet were nice and toasty, even in minus 6 degrees F on my Kili ascent.  But....there is a little tiny bump on the top lip on the outer part of the ankle that is annoying when hiking down hill.  Plus I got a blister on the bottom of one heel, and I never get blisters.  Luckily I only wore these for a couple of break-in hikes and the night/day of the ascent/descent and got back into my comfortable Montrail Mountain Masochists for the balance of the trip.  Other good thing is that these Keens were reasonably priced so I just gave them to my guide post hike.  He was jazzed to get them.