Next winter will be a better test, but so far, I love these. The heat wires go up each finger and the thumb individually; it makes a huge difference.

I had them on in the car, on the highest setting and it felt too hot, but I imagine that might not be the case outside in the cold.

They might be too thick and clunky to operate brifters because they are leather and then thinsulate and then another layer of liner. I could operate the brakes fine and I have bar end shifters, so no problem for me.