I never had good luck with Mucks and started buying LaCross a few years ago. I have the whole range, from rain boots to the Alpha for extreme cold. So far, they're holding up better than any others I've tried.
As far as warmth, I keep them on a boot dryer/heater. Game changer! And I did use a pair of Mr. TC's heated socks last weekend. They worked great but the batteries are annoying (at least for me). And BTW,
@Jeanne - Simme Valley, you had asked (maybe last year?) about the heated gloves, and I discouraged them because they're so big and bulky. Mr. TC got a pair of heated glove liners this year and he loves them. There's still the battery pack behind the wrist, but they're thin, the heat extends to the tips of the fingers, and he can even use his phone with them on.