Ventajas
Great company to work for. Great products. Good employee discounts (Were better before iPhone 3G became subsidized). Good discounts with other businesses as well. Very laid back atmosphere (Never been somewhere that didn't have a dress code before). People have even interviewed while dressed up in costumes and gotten hired. Unlike many call centers I have worked at, Apple actually has time available to be used in the case of a family member being sick. This is extremely helpful when you are a parent with children in daycare, which is all to common these days.
Desventajas
For working in the AppleCare division: As with any call center there is the strictness to adherence and also to attendance. This has never become an issue for me as I've worked in call center environments for over 10 years now and that is really a downside to all call centers.