I bought some UA a few years ago. Not sure what grade I got though (1, 2, or 3). I believe it is the 3 though because it was specifically tagged for cold weather. I have to say that it has worked pretty well. I find that I don't get as cold as I used to.
Having said that, my problem is my feet. When my feet start getting cold, the rest of me gets cold. Thank God for those Grabber foot warmers. They have practically eliminated my cold feet issue. I cannot recommend them enough. I stock up on these things prior to every season and I never leave home without them. They cost a bit more than the toe warmers but I find the toe warmers don't provide enough warmth on the really cold days. I have used them even with uninsulated boots and remained warm.