To clarify, I haven't tested out these boots just yet (bought them for a trip to Canada next month) but I can already tell they are very warm even though very light weight.
I purchased from CampSaver.com because this was last year's style and unavailable on Columbia's website and the price was better here than anywhere else (even eBay). I was a little hesitant to make the purchase based on some reviews of CampSaver, but I ordered these on 1/08 and they arrived about 9 days later.
Just keep in mind that site site isn't Zappos or Amazon Prime and it's going to take longer than 2 business days to get your gear, but it's totally worth it!
This review was written in the old system and had content requirements that are different than reviews written today.