I bought a Vero Vellini sling a couple years ago and didn't like it. It felt like my gun was hanging by a rubber band over my shoulder. The sling was OK, I just didn't like the stretchy neoprene it was made of.

The slings that I use on all my rifles and turkey shotgun are the Uncle Mike's Ultra Sling. They are made of cordura and have a non slip backing to keep the gun from sliding off your shoulder. The price is right and they look good also. You can check them out here.