I have Klim Velocity boots (snowboard style support), which I got after using/wearing Altimate [also a stiffer, snowboard style boot] (
http://www.altimateboots.com/store/...20673114286b1d95c2140269f39f82&products_id=80)
The Velocity is similar to the Klimate I think...older model.
The Klim is lighter and smaller..and definately noticable during the day.
Both boots I end up with wet feet, but yet, plenty warm all day.
Left side foot gets soaked (clutch heat + foot sweat).
Right foot gets a bit damp..
But as long as my feet are warm, I have no problems, and they both stay warm.
Getting them dried out by next days ride can be an annoyance tho..
It took a bit to get used to the snowboard ankle style boot, but I like them a lot now. They are GREAT for stand up riding. But sit down riding all day, they'd get uncomfy, of doing a lot of hiking in em. I have no probs with the typical walks through the snow to get buddies unstuck tho after you get them broke in some and used to em.
If you go snowboard style, I'd really encourage a velcro strap for the top of the boot, I noticed Klim went away from this? But it adds a whole lot of support/leverage to get your ankle/shin support tightened up, compared to just laces.
I also like the HMKs take on this, with their lacing system, I was looking into those if I wasn't able to fix my Klim's..