I've never gotten anyone to switch that I know of yet... which saddens me XD A friend of mine really wanted a Mac but for some reason decided to get a Dell instead. I think it's because she's bad at saving money and had no credit.
3 months later, her computer was overidden with viruses. She paid over $200 to get it fixed.
She now regrets her decision fully
So I'm pretty sure that's one switcher for the future, at least.
I'm also positive my mother's next computer will be a Mac after all she's gone through, and I'm trying to get my father and brother to switch too, also the virus problem XD I'm suggesting a Mac Mini for them.