i think the best feature of apple laptops is indeed the ability of running osx. other than that which is obvious, i like that my powerbook is a true desktop replacement (after i exchanged the internal hard drive to a 7200rpm one). there's just nothing missing, except i can never have too much speed as i use protools and often stress the system to its limit.
apple hardware looks just blow me away. i love the minimalist approach - no unnecessary buttons or lights, just the keyboard and one-button trackpad. they could even drop the button altogether, one can always tap it 😉 there just isn't a more beautiful computer than an apple powerbook in a dark room. lighted keyboard in front and apple logo on the backside.
did i already mention the size? any smaller and it would be ruined - make a computer too light and it begins to feel like a toy. performance must always weigh something, and i think this way because i know "something" about audio technology (where sometimes you can value the usefulness of analog gear by its weight 😀 seriously.). i think their design team has hit gold when they associated POWERsomething with aluminum...