Pros
Depending on your business unit and position, you may have the opportunity to travel to Tokyo HQ, conferences, etc. The pay is good, but below average for corporations of similar stature and certainly not worth the insane overtime. Despite hard times, Sony is still a prestigious name to work for, and projects can be interesting.
Cons
Expect to work like a dog. Any mention of work/life balance is lip service and nothing more. As in many large organizations, there is little oversight and accountability, so if you are of the persuasion, you can get away with murder. If you aren't, expect those that are to keep you working 24/7 to carry their dead weight. Corporate culture is staid, conservative and as you can probably surmise, acridly bitter. If you aren't Japanese, you can forget the notion that you will ever be promoted. There are very few western "lifers" in the company, and those with a long term investment here are meandering due to low motivation. Project work is highly interesting and challenging, but anything worthwhile is suffocated by the culture of committees, meetings and paralyzing indecision or apathy.