shrugs. i've had fewer problems with my mac than any laptop i've ever owned, and i use it orders of magnitude more.
they are expensive, but worth it, in my opinion.
I use my HP about 10-14 hours a day and haven't had any issues. What other laptops have you had/what issues have you seen with them?
Gateway, dell. My friends have had HP, Asus, gateway, dell, etc... and they are most of the time less reliable than my mac.
My girlfriend has had a MB for 4 years and the only problems with it haven't really been the machine's fault. Spilled drink on the keyboard, etc.
I'm sure there are PCs that fair as well, but in my experience, they're farer and fewer between.