Should have bought this years ago but there wasn't an option at a price point like this. Bought the vest mainly for the front windblock and the rear vent. It performs as expected. However, I am loving the access to my own jersey pockets. This has been easier than I expected. I have used it twice on 2 long road rides. I think the vests rear pockets are kind of hard to use, but the side access from the vest to your jersey's pockets works great. I ordered a medium and I usually wear a medium in the American fatboy fit. The medium was snug when I first put it on and zipped it up. But after getting on the bike and in the riding position, it fit good. I am not sure if I would recommend sizing up. It depends if you like your vests/jackets flapping in the wind or not. I looked at about 10 vests before I bought this one. Right now, there is not another vest on the market that I found that has the rear pocket access like this vest. Hope this helps, keep on riding.