I had the lowa gtx evo Extreme last year. (they got burned up in the fire in Paradise) I felt they were extremely stiff and took a significant amount of break in and getting used to. Lots of heel rub the first few outings, no blisters just hot irritation. That being said, I grew to love them for their stiffness and the support they gave. They were clunky and I certainly did no ballet in them. (sometimes that is an issue, think boulder hopping). Overall the Lowa experience turned me towards stiffer and more technical boots.
Because I had to replace them, I got some Crispi Nevadas and for Christmas someone bought me the Asolo boots. My current order of preference would be the Asolo then the Crispi, then the Lowa boots. But again, I have not been on the mountain with a full load with the Asolo or Crispi boots yet.