I wore these a couple days so far and have been very impressed. On a clear and not-too-cold day in Colorado (about 19), my fingers were sweating even after taking the liners out. The next time I tried them, the temp was in single digits, very windy, and snowing hard - the lift ride would have been miserable without these, but instead my hands were toasty warm all day with the liners in. I would have given them 5 stars if the liners were glove-style, that's the only thing I can find wrong with them.
All in all, these are fantastic mittens for the price, but save them for really cold days.