I used to sound like a lot of the Mac bashers here. When the flat panel iMac came out, I thought, "wow, that's cool." It was time to upgrade my old PC, and after looking around, I settled on the flat-panel iMac. What finally convinced me to go with the iMac was the construction quality. This was when Compaq was putting the colored panels on their computers to make them look like the original iMacs. There was something about the way the flat panel on the iMac would glide smoothly and silently and stop exactly where I wanted, compared to the Compaq with some dorky little panel on front that screechily opened to reveal a cd holder that would hold about 5 cds. I checked the prices on everything, and Sony and IBM were the only companies that had nearly the build quality, and by the time they were equipped like the Mac, they cost more. I had used every version of Windows from the run-time version that came with Excel 1.0 up to 2000. Windows ME finally killed my allegience to MS and the PC system.
When I got the Mac, I noticed that all the things that sort of worked on my old PCs actually worked on the Mac. I realized that the features that were grafted onto the Windows system like trying to nail limbs on a tree were integrated into the Mac seamlessly.
I use a 17" flat panel now, and there's no way I'd ever go back to Windows.
I know someone like that too. He would install extensions and control panels from various other computers with different operating system versions, often with disastrous results. (Now Mac OS X prevents him from trashing his operating system, so he refuses to use it.)