My only issue with open carry is that it could be a double edge sword. On one hand someone who sees you carrying may be deterred from criminal action, as one would expect. However with guns remaining highly sought after items, particularly from the seedier criminal element, I think you may be asking for a theft. Not necessarily a robbery (though thats possible, and the element of surprise is on their side as usual), but should you be somewhere public, and then legally, and possibly unexpectedly, have to disarm, say having to return to your car. Opportunity presents itself to a criminal.
Of course the police will also likely get a call. Though as long as you're not committing a crime, you are not in the wrong. I am glad open carry is legal in Ohio, I just personally wouldn't do it.