Pros
The people you work with are amazing. The work is interesting and is focused on doing good in the world. The campus is awesome, with great food, private or two people offices, and awesome managers. The pay is good. It may not seem great for the work at first, but if you do well you can get large raises (my second raise was nearly 30% - not to be expected but possible if you get very involved - and my other raises were very generous)
Kontras
You will work hard. This is a company where they push you, and they'll keep giving you things until you feel like you're about to crack. There's too much to do for the number of people they have, so they'll try to get you do to as much as you can. With that said, it's not a problem to just say no. Many people don't realize that, but saying no to an opportunity is perfectly fine, and you should wait until the perfect opportunity arises and then jump on it. Don't be afraid to tell your manager you're overloaded. They can and should help, and if they don't, go to their manager.