This is a great way to add a stylish layer to your riding garb. I only wear wool layers already, so this is a great insulation layer that looks much more stylish than the usual skin-tight base layers.
Sizing is pretty true to other V wear. I am 6.0 165 and wear a medium in just about everything from t-shirt to outerwear. It does run a bit long, but this is great for riding IMO, as it helps seal up any drafts you might have back there when going for a grab or tweaking that 270-on to front board slide.