Bought these on a whim (and hey, they were on sale!). Since I already own a pair of cold-weather bib tights, I thought I would try something different. I like the idea of being able to separate the leg warmers from the bib shorts. From a few recent rides, I can attest to their cold (for Southern California) capabilities (35-50ºF). Even when the mercury picked up a little, I never overheated.
Two downsides - the chamois does not seem to be as comfortable/supportive as I have experienced on other brands. But, I am not one to knock out long rides in cold weather. Also, and this is something I experience with other long leg warmers, the leg warmers end up giving me an extra "bubble" or "roll" where they end near my upper thigh/inseam. A bit odd when you are walking or posing for that perfect Instagram shot, but you cannot see that on the bike.