It has a profound effect on his life. He instantly became more charismatic and fun to be around. Everyone "felt" what a nice guy he is, and I'm not sure if it was because of a behavior change or if they were just realizing the person he always had been.

The only downside is now when he ACTUALLY is angry he is still smiling. So people don't take his complaints seriously, they think he is just joking around. I talked to a couple bar tenders who he had to fire, and they said the experience was profoundly disturbing.