The Wool is great. I live in the cold northeast and have gone outside below 40f and felt warm. On the coldest day, I wore it underneath my jeans and I never felt cold once, unlike with some of my other thermals which don't have great uniformity in keeping you warm. On a semi warm spring day (60s) it was great at keeping my heat regulated.
Get a fabric shaver. Like all wool products, this pills, especially when worn as an underlayer. So a fabric shaver will keep it looking fresh and new.
Just a personal thing, but I wish it had a decorative element on it somewhere. Joggers typically do with a logo or stripe or something, and sometimes walking out with these on, it just feels like I'm wearing pajama bottoms or just thermals.