Pros
Akamai is a great company to work for in terms of talent and the kind of work they do. The colleagues you will work with and extremely bright, talented and motivated. You will be exposed to a lot of different areas in the Internet world and there's a lot to learn. Most groups are open and you can always just go walk to someone and ask about their product.
Cons
Career development is almost non existent. Moving between different levels of engineering doesn't really matter much. There's still a lot of old guard in the company and it's not easy to compete against them in terms of promotions (which in a way is good). A lot has changed in the recent years with a number of acquisitions and the company is no longer as tight knit as before. Benefits are nothing to write home about.