I've only had the opportunity to use them as rain boots these past couple of days, but they have definitely excelled on that front.
I've also worn them all day and they've been very comfortable. I'm a 9 and the size 8 fits perfectly. I can't wait to actually get to use them in the snow.
My last pair lasted 40 years. These are insulated with Thinsulate which wasn't available back then. I've only worn them for about three hours but they already feel broken in.