I've always disliked ankle and chest rigs, just aren't for me. Last I checked there's only been one case of in all of the United States of someone taking a weapon form some one open carrying. I used a kydex holster made by Black Dog Concealment. Great setup.
That's a statistics game, IMO. The number of civilian open carriers is miniscule, as a whole. It happens to LE often enough:
http://www.policemag.com/list/tag/gun-grabs.aspx
If every CCW'er switched to OC, you would see the numbers go up, IMO (although, yeah, the number of armed people of any type, is still miniscule, compared to the population at large). And the "shoot me first" factor is undeniable. If you were planning to kill for a gas station register, and you walked in and saw a dude in front of you with a pistol on his hip, what would you do?
I'm pro 2A all the way, been carrying for 25 years... but to me, open carry introduces 2 possible detriments, in the hopes of gaining some form of deterrence.
But again, I'm all for it, from a liberty standpoint. I love not being required to wear a helmet when I ride... but I do in most cases. I'll tell you when open carry is great: When you're in training, and need to run down the road for a can of Copenhagen - you don't need to do the gear and wardrobe dance!
To each their own, variety is the spice of life! Stay safe.