I learned w/a baseball grip, read a Jack Nicklaus book & tought myself the interlock, then about 3 years ago switched to the overlap.
I like this grip a lot. Relieves the pressure in the forearms so I don't grip too tight.
I'm righty, but bat lefty in baseball. I have a lot of bat control that way.
I can't swing a club worth a dime lefty though! I never had any lefty clubs growing up so I learned righty!
I can putt pretty well lefty. Thought about it.... 8)