I guess I'm going to be the lone dissenter regarding shoulder rigs.
I have utilized a Bianchi Tuxedo Harness for the past couple of years, and for the most part it's been worn on a daily basis. Granted, I'm carrying either a G23, or a Colt Defender and two spare magazines - not full sized 1911's, Glocks, ect....
As mentioned, shoulder harnesses excel while traveling by vehicle. In the winter, they dissappear readily beneath a heavy jacket. And, in the summer I usually wear a loose fitting untucked shirt over a T, or sometimes a vest. Also, my rig conceals well beneath a sport coat.
The Tuxedo distributes weight across my shoulders, and I find that at times I don't even know it's there.
It is infinitely adjustable and can be set for horizontal, or vertical carry(up, or down) - or any position desired in between.
Actually, I have two of the aforementioned: one adjusted for a G23, and the other for the Defender. They're a pain in the butt to initially adjust for one's own personal specific body type, and preferred carry position, but once properly set up I hardly notice I have it on.
.02 - and I expect I'll get a bunch of flames. Well - to each their own, and this rig works for me.
paddle3