Pros
Great vibrating atmosphere in the hallways and rooms. Anytime you drop-by, you'll notice people walking with a smile on their faces. Great people to work with. Both professionally and personally. Lots of career opportunities, regardless if your intention is moving upwards (management) or sideways (expend your skills and experiment with new areas). Compensations are high, with lots of add-on: You get something for providing CV's which ends up with hiring, B-Day gifts, cool holiday gifts, company trips and much more. HR and Management make sure they are updated with any personal situation you might have, and are there to help in any way they can.
Cons
The company is growing fast so you might find things a bit "messy". Its up to you if you use it for growth (Pro), or complain about it (Con).