Pros
The work culture and people are amazing. P&G invests a lot of money to develop all their employees to become great leaders because they are a promote from within company. All senior leadership started out from the bottom. The company strives very hard to make money and does a great job doing so. That is why P&G is always in everyone's stock portfolio. You do not have to worry about being hurt by recessions or the company ever going under. There is tremendous job security within R&D.
Cons
You are working on consumer products - toilet paper, shavers, laundry detergent. You need to be wary of spending the rest of your life improving non-glamorous products. Don't get me wrong, there is tremendous innovation behind all P&G products and you will be challenged.