I'm a fairly warm rider so I can't stand to have a long-sleeve windbreaker or jersey on. So I love vests. This one takes the cake. It fits great, has a very soft collar that doesn't irritate my chin, and is very breathable in the rear. It's also plenty lightweight. I bought it primarily for bike touring, but can picture me wearing it on roadie rides as well. It's the perfect level of warm when the temps are in the 50s or 60s and all I want to do is wear a jersey and arm warmers.
I'm 6'0" and 202 pounds and the XL fit me perfectly.