Pros
Because the company is so large and diverse, and because they are committed to acquiring and keeping talent, once you are hired there are a lot of opportunities for movement in many directions: people interested in moving overseas can apply for positions all over the world; if the corporate culture of FMI proper doesn't work for an individual, they can move to one of the integrated subsidiaries (e.g. Climax Molybdenum), etc..
Cons
I was only at FMI a short time, but I got the impression that it moves very slowly. For an MBA, promotion into the lowest management levels takes about 2 years, and it seems to take another 3 (5 years total) to have direct reports. FMI proper is also very bureaucratic, with many decisions requiring several levels of approval, and pages and pages upon policies to control internal processes.