Pros
Casual Dress and Great Attitudes of Co-Workers. The majority of people that work at the Apple store are "fan boys" so to speak, so they are all happy to be there and have a lot of pride in the work they do. Compared to other retail in-store computer repair jobs, the mac genius position pays very well. i.e. Geek Squad in store techs make about $12, this position pays around $18.
Cons
If you come from a windows background/experience, expect to be made fun of (jokingly). Management will almost always side with the customer no matter how poorly you were treated. Apple's #1 priority in their retail environment is to satisfy the customer, they don't have to be as conscious about the effect on the bottom line of giving services (and product) away for free.