Pros
It's really nice money for such an easy job. This is one of the few companies that still provide pension benefits. Once you are established, employment here is very stable, unless you really mess up. There are some nice opportunities for training and development via classes or meetings. There are some nice opportunities to travel and experience another culture. You can choose your environment. PPG is such a big company that several different types of work environments are available, from union shop to a more free-wheeling startup, from large factories to smaller sites, from the research environment to fast-paced but low-tech manufacturing. You should be able to find a home somewhere.
Cons
It's old manufacturing. The company is struggling with unfavorable economic conditions, international competition, outsourcing, cronyism. There is a constant need to do more with less and a constant pressure to reduce headcount. I don't know how many people actually retire from PPG. I think most separate at mid-career. The work tends to become routine, and it is hard to break out of a role or professional level. A few people are identified as high potential and if you are not one of them, you really just have more of a job and not so much of a career. You have a year or two to create that perception and if you don't do it then, it seem you are pigeonholed.