Pros
I absolutely love working for this company. Great work life balance. Great career development support. Amazing benefits. The company has employee resource groups for just about every type of employee out there: LGBTQ? Yup. Asian American Pacific Islander? Yup. African American? Yup. New parents, or parents of special needs kids? Yup. What about commuting? Well, they subsidize just about every form of mass transit and on site parking (it's actually better if you use mass transit). On site fitness center, wellness rooms, starbucks, cafeteria? Yup, all that. For those on an annual incentive/bonus - it's pretty awesome as well. But what's the best thing about working here? The work I do actually helps treat people sick with some of the most pernicious diseases you can imagine. It's a great feeling working for a company that works not only on the flu and diabetes, but some of the most obscure rare diseases and cancers where there are only a few hundred people with the condition. It's rewarding, and I wouldn't change it for the world.
Cons
About the only one I can think of is the occassional 5am-8am conference call because of working with international offices overseas. The world doesn't all work on Eastern Time...