Avantages
Flexible hours / dress code (in my building anyway), everyone treats each other as equals. I'm a software guy, and they treat us better than most employers in Austin. Things are largely a meritocracy, so if you have a good idea you can make a difference regardless of rank. AMD is big enough that you can find projects that will interest you, and managers are usually pretty good about letting you work for other teams and/or on something that you will enjoy more.
Inconvénients
There are some serious documentation black holes (either it doesn't exist or it's old/wrong, hard to find the information you need to do your job). They expect you to work hard (I know people working 70-80 hrs), but aren't big sticklers for face time. Just get it done.