Ahhhh, I am going to upset the apple cart!
I have used many shoulder rigs in my times
(ie. Safariland, Galco, Bianchi, Uncle Mikes), and found the most comfortable to be the Uncle Mikes fabric vertical carry shoulder rig with dual mag. holder on other side. The Uncle Mikes has many velcro adjustment straps built onto this rig and you can customize it to fit YOU, not somebody else ! Plus, it is half the price of leather! And very light weight!