(Black/gold) Keeps me warm down to the mid fifties on sunny days and, with a vest, into the high forties. Not really any room for a base layer since the fit is definitely snug (based on size small / 35" chest / 30" waist / 130 pound rider).
Quality is what I normally expect from LG. It is wonderfully soft and comfortable. Zipper operates smoothly even when carrying downhill speed. There is no excess fabric to flap in the wind. The length is good - no bunching in the front and plenty of coverage in the rear though not really an issue with bibs. The jersey is very breathable and restricts wind somewhat but does not block it so you stay reasonably cool on the climbs and zip up to stay warm on the descents.