Pros
Fantastic company with cutting edge products in countless business segments all over the world! Good pay with great benefits. You will learn a lot about doing business internationally, and meet many smart, kind, and warmhearted people in the process.
Cons
The Japanese business culture is diametrically opposed to what most Americans are accustomed to and it can be a very difficult and stressful environment for those unfamiliar with how the Japanese business world operates. There are plenty of books on this topic along with lots of information on the Internet. I highly recommend researching the cultural differences between your home country and Japan. The hours can be long and work/life balance can be difficult to achieve depending on the team you're working with.