I have a Galco Jackass rig for my 1911. It isnt a bad setup, though I wish the straps were a bit wider over my shoulders.
The one thing I would suggest before buying a shoulder rig, make sure its something that you will use. I thought is would be the best method to carry a bigger gun, but have found that I tend to favor IWB carry with a good holster and belt, even for my full size 1911. The shoulder rig tends to get left in the closet, until hunting season, or occasionally when I am on my motorcycle.