I don't have any solid figures (I'll try to find some later), but, the general consensus is that the violent crimes are down where we're allowed to carry, I want to say ther's been around 9 or 10 well publicized SD scenarios played out since our CCLs and castle doctrine laws have passed. Lord only knows how many have actually happened that haven't gotten any airtime. The only time we hear about 'em is when there's a good chance the good guy is going to end up with his/her ass in a sling over what happened...and the story quickly fades away as all of the details come to light and the person is no-billed.
On a side note: I finally saw my first gunbuster sign in Rice Lake this last weekend...at a furniture and flooring shop (granted, when Act34 first passed they went up all over the place...and came right back down again as businesses figured out that by posting they were legally liable for our safety).
I have to admit, I kind of made an ass out of myself, but...it was fun and it got the point across, and I was out of my "No guns = No money" cards.
I knocked on the front entryway door and a salesman stepped out and I asked directions to the closest Menards as I needed to buy 1500 sqft of laminate flooring and 900 sqft of tile. Guy invites me to step inside and take a look at their inventory and I politely declined stating the management obviously didn't want me in there due to their magical "No weapons allowed" sign and I didn't feel like disarming to shop for flooring.
He took it like a champ though, he apologized for the inconvenience and gave me directions to Menards (I knew damn well where it was, and he knew it<g>). As the door closed I heard him holler to someone at the customer service desk that they'd just lost another customer due to the sign.
Somehow I see that sign coming down in the future.