Pros
Really smart and engaged engineers and scientists and people who work hard to do good things. Each org/team has a unique set of challenges and are empowered to meet those challenges as they see fit, resulting on a lot of duplication of effort and infrastructure - but secrets prevent sharing of tools and knowledge. Team culture is hard to get a sense of and it can vary significantly under the Apple umbrella.
Cons
It is the worst place I have ever worked as an engineer and thankfully my last. Management is full of bullies who have no idea about the technologies we work with. I've been called stupid to my face multiple times and probably far more when I wasn't there (as reported back). I've see managers push on things in meetings and conference calls to the point where the messenger bringing the message is at the point of tears. I've seen support completely withdrawn from people who needed medical care. I've seen a complete lack of concern among management about teams, how teams work (or don't) and how to do things better - management doesn't seem to care. Management is complacent and lazy and sitting on tons of RSUs since "they made it" but are clueless about what others are trying to accomplish. I've never seen a management team work against their employees the way I've seen them work against people here. I've seen a director level manager belittle people on topics they know nothing about and are completely wrong but go unchallenged because your career would be toast.