Pros
Being a global firm, I was able to gain experience working on a number of different proposals in a variety of sectors from around the world. There are also some really great individuals who work at the firm. Paid overtime.
Cons
This firm is NOT family friendly, especially for working mothers. It is an "old boys club" and that is evidenced by their management team. The hours can be long and deadlines can be back-to-back-to-back without a break. Principals do not hesitate to take on more proposals than is possible to complete in a thoughtful manner. They do not understand that spending more meaningful time on a smaller number of client-focused, customized proposals is better than submitting more proposals filled with boilerplate, cut and paste text. Their architecture is mediocre and difficult to promote.