I bought La Sportiva Spantiks last year and they have been great for cold weather. I have used them all over the cascades during the winter. Plenty warm and they climb well for me. There have been reported issues with the lacing system, however I haven't had any issues. The bigger downer is the price point. Hopefully some sales may pop up soon? I got a good deal on brand new ones last holiday season (about 40%). IMO these boots are awesome for cold weather climbing. I think Dane Burns blog has an in depth review on them.