Amgen is a great experience. The work environment is pleasant, the office locations also pleasant. Staff is diverse, driven and competitive and there are a lot of women; however, you will not advance on merit alone. Management is male-dominated and not as diverse. I've encountered sexist comments and snide remarks from upper management. Many women don't seem to advance as quickly as their male counterparts. Also, while maternity leave is generous, women are judged harshly by some colleagues and managers for taking time off.
The company is going through some major changes in how they used to handle things. The child care and other benefits that once made this a great company for women are being changed and cost more or being phased out.