Yes I do Simsane! I raised my son that way, and everyone balked about my 'spoiling' him. Though he's always been such a good boy. He was such a good student that he got an exemption from having to do final exams in his senior year, and has a scholarship waiting when he gets out of the army (He joined about halfway through his senior year). Because of his scores being so high he when to airborne jump training right out of basic training. We were told that he was a first...that they don't get to go to airborne school that soon. Now he's army airborne special forces and is in the Middle East protecting the rest of us (even those who complain about our military over there). You couldn't find a finer young man if you looked the country over.
So from that I can say that, yes positive reinforcment does work much better than punishment. By the way; If I sound like a proud mother it's because I am. 