I am debating using this or the Koflach...
I am debating using this or the Koflach Arctic Exped for Denali. Any thoughts on which is better? Also how does a gaiter attach to this boot?
Personally, I'd recommend the Spantik's...they are somewhat newer and seem to have better ratings overall. I also just happen to REALLY like La Sportiva as a brand, and thats from personal first hand use.
As far as attaching gaiters...they should attach the same way, you may just want to order them a size bigger.
I used the Spantiks on Denali last year. 7 out of a group of 8 used them, actually. They are warm enough, although on summit day you'll probably want a pair over overboots. You'd need those for the Koflachs too, so no difference there.
If I'd have to choose again, I'd go with the Spaniks again.
The Spantiks all the way. The Koflach Arctic Exped are really stiff, heavy, and durable boots. Denali has a huge climbing prominence so you might need to bring a second pair of boots for comfort. The Koflachs will kill your feet for longer climbing.