The attention to detail in Apple products is incredible... when I first used a Mac, it was the most advanced thing available. Microsoft had just gotten out of DOS and released Windows, which wasn't nearly as elegant. And Windows has never really caught up.
As a so-called "power user," it becomes apparent how much thought and consideration goes into every aspect of the OS and hardware. Nothing even compares. I'm not saying that everything is perfect, indeed there are some flaws, many of which are minor. But the bottom line is Apple produces a quality product when the other companies seem to regard quality as an afterthought.