Pros
Challenging work. Great corporate culture. Ownership of your work and results. Tremendous benefits. Opportunity to manager your own career. Brilliant co-workers -- all my managers so far have McKinsey / HBS pedigrees. Risk-taking / entrepreneurial environment. Willing to invest in emerging technologies. Great place to learn cutting edge digital marketing analytics -- world-class in paid search, natural search, display, and in-house technology integration. Work side-by-side with highly capable engineers. Really fun / adventurous coworkers. Invest in world-class facilities to retain talent (bowling alley, indoor basketball court, etc.). Merit-based upward mobility. Opportunity to gain equity. Still private company so can maintain long-term focus and investment discipline.
Cons
Slightly below market pay for entry-level analysts. Can be long hours if you're on the sales operations side.