I'd always considered Macs inferior to PCs, but a couple of years ago when I was in the market for a new laptop, I fell in love with the looks of the iBook. I didn't need it to be particularly powerful as Matt and I both had all-singing all-dancing Dell laptops for work, plus a Dell PC. Believe it or not, I bought it simply so that I could DIS from the sofa! I thought I'd never get used to the functionality after a PC, but it soon became second nature. And rather than being second rate, I found that it actually has some really nifty operational tools (albeit I think Windows has probably plagiarised a lot of the cool stuff now) such as "hot corners" and tabbed browsing. I also love that all the software looks and behaves identically (iTunes, iPhoto, iWeb, et al). Also, you
have to give props to Apple for being brave enough lauch the iMuff.
About 18 months ago we invested in an iMac, so we're now a two Mac household. I use Safari out of habit and because I've got all my Bookmarks set up in that. We've always had Safari and Firefox installed on both machines, though, and it's very simple to launch either from the Dock. Occasionally I have problems with certain websites (tends to be with shopping carts. online ordering and the like), so I'll then use Firefox. You can run both browsers simultaneously, so it's no biggy.
If I've been using Safari for a long period, it will sometimes become slow and eventually lock up. It seems to eat up RAM and then fail to release it, even when you're not doing anything. The trick seems to be to close Safari periodically (actually quit it rather than simply closing the windows or tabs) and relaunch it - that then frees up RAM.