Excellent for cooler temps
I purchased these bibs, along with the matching short sleeve jersey, arm warmers, and socks for colder rides in Colorado winters. I'm 6', 135 lbs and got a M bib, S jersey, and S arm warmers. Everything fits perfectly. I have long, thin arms, and the arm warmers actually stay up! They are long, and actually bunch a little bit at my wrists - no big deal but if you're shorter than me you'll have a decent amount of bunching.
I got to test the kit out yesterday on a 40 degree with no wind. The bib, as people have mentioned has a real thin layer of fleece on the inside that adds more warmth than I would expect. The legs come down to about shin height, and with the socks I had about 2-3" of bare leg. The bib overall is ridiculously comfortable. Feels like you're wearing pajamas while riding! The material has a good stretch as well, while maintaining it's warmth. The chamois is nice and form fitting (no diaper look), though thin compared to others I've worn. The straps are a great length, and overall it fits pretty snug.
The jersey is a touch short (had to get a S due to my lankiness) but expected. It's a little heavier than my other jerseys, so adds a little warmth as well (not much though). I wore it with a base layer underneath, and a wind shell over it and was fine in 40 degrees (with arm warmers, of course).
The socks are your basic thin, breathable sock. Nothing fancy.