Pros
Benefits are good, very goal-oriented; no one cares how long you go for breaks, as long as you get the job done. Biogen-Idec is exemplary at picking talent at the operator level, I have worked with some very passionate and knowledgeable people whose work ethic is inspiring, and who have influenced me to become a better operator. BIogen-Idec is also a good place to start a biotech manufacturing career, due to great networking opportunities and adherence to cGMP's, which is critical to understand if you want to become a great contributor.
Cons
Unfortunately, Biogen-Idec is awful at picking talent in the management level; lower performers are constantly being promoted due to politicking and back-room dealings; most promotions announcements are met with shock and groans from the operators, even through there are very, very, very few exceptions. Management is very company-oriented and not employee-oriented; members of management are not judged by their superiors in knowledge and subordinate growth but simply bowing to their demands; and it seems that the supervisors most disliked by the operators are the ones getting promoted. Communication between night and day shifts is horrendous, with constant blame game playing and finger pointing when things go wrong. Bonuses are so-so, pay is probably slightly below average compared to other companies I have worked.