The nice thing about the UrbanERT is you can go from weapon to weapon with it with little to no effort. Adaptors come in several different styles for the different weapons. Check them out.
I've gone from el cheapo 2 points, to super cool 3 points, to uber tactical single points and now I'm running the Vickers Blue Force Gear padded 2 point sling on my HD shotguns and rifles. In fact the Vickers web page was running a 1/2 price sale on the cammo green slings (got some for Christmas).
You can't go wrong with either a Vickers or Viking 2 point.....
I second the Vickers sling by BFG. I bought one of the half price padded slings for my 556. Although money's tight, I just ordered another for my Benelli since I liked it so much. With the half price and free shipping (free shipping ends today) you can't beat a top notch sling for $24 to your door.
I use a three point sling on my work MP5 and like it. I've tried a single point on it and my 556 and hated it. The single point sling does very few things well, while a quick adjustable two point does almost everything well. The only down side of the quick adjustable two points is off hand transitions are slower and a bit awkward. The utility of the two point far outweighs that one down side. YMMV.