Pros
Cool brand, lots of great marketing, exciting to be affiliated with Branson (he actually comes to visit 1X a year). Some departments have entrepreneurial attitudes while others do not. Co-workers are passionate about the Space frontier in general. Lots of smart engineers. You get to see the space craft up close and personal. If you are in manufacturing, you are building it with composite material.
Cons
Awful location - Mojave dessert, there is NOTHING there. Forget a social life it you are city bound, wish to date cosmopolitan girls / boys and love international atmospheres. People move out because of the location. Co-workers are a combination of 40s/50s old Aerospace, new ivy league grads, ex-SpaceX-ers, and random mixes from Boeing in Kansas or Adams Aircraft - as a result, the conflict and politics between those groups are pretty bad with a lot of dedicated people leaving. Managers play favorites. Work hours in some departments are 10-12 hour+. If you are not an engineer, you are not valued and won't get anything interesting to do.