Pros
Mission: Revolutionizing space flight and making humans a multi-planetary species! What is cooler and more inspiring than that? Benefits: Amazing health care, stock awards, and a lot of perks. Travel: Opportunities to work at launch sites and test facilities means paid visits to Cape Canaveral and Kennedy Space center, opportunities to view rocket launches, and see hardware being tested in Texas. Swag: Awesome apparel and accessories for dirt cheap.
Cons
It's hard and it's not for everyone. If you're looking for a unionized, sit around and wait for your turn to torque a nut then go sit down again type of job, SpaceX is not for you. You are expected to be flexible, self-driven, and willing to work outside of your comfort zone when necessary. Pay: Hourly pay rates/salaries tend to be lower than comparable companies. Overtime and stocks can make up for it but the base rates could be better.