I used to be a die hard Windows user.
Then I started to realize how crappy it was and started experimenting with Linux. Then I realized that I’m not the Linux type, sure I can do normal day to day stuff just fine in it, but compared to how acquainted I was with Windows (I would consider myself a power user) I couldn’t accomplish the same tasks.
In mid 2007 I got myself a MacBook being reassured by the fact that if I didn’t like OS X I could always install Windows on it. Since I went Mac I’ve never gone back.
When I got my new MacBook in April 2008 I had to go without a Mac for a week because I didn’t want the deal to fall through like it had a few times before. I had to use my Windows desktop, and during that time I had come to dislike Windows XP even more.