Pros
The opportunities for education and personal growth within IBM are amongst the best in the business. Even when education budgets are slashed, the resources that IBM provides to its employees are amongst the broadest and most comprehensive. IBM is also very respectful of the balance of Work/Life, and takes great pride in providing flexible scheduling and location based working opportunities.
Cons
The best and brightest at IBM are often restrained from doing their best work because of the numerous interruptions and distractions that are constantly present. When a resource at IBM is discovered to be competent, their performance is hampered by their less competent peers. It's the law of averages working against a company that has the potential to be more innovative and more creative than most of the competition, but the large population that IBM takes pride in maintaining weighs it down.