Many people just love Mac OS and the designs of these shiny things so they're willing to pay more just for that. I don't.
The looks of this thing is the last thing I paid for, but it's a good thing to have nonetheless. I like how, while programs still can crash, there's blue screen of death and endless whacking of alt+ctrl+delete. If a program's no longer responding, you just choose "close program" and it closes immediately. Easy as that.
It's overall very stable. In fact, I HATE using PCs now. Almost everytime there's some problem, or it's slow as hell, even though it's good by its specs.