Pros
Pinterest hires really smart, talented people who have wide experience but are also humble and like to celebrate wins.
Pinners really love the product which actually does motivate you to work hard, it's nice to work on a product that is so well liked by users.
Great benefits, especially for parents/people looking to start a family. Food is fantastic and you'll get 2-3 meals/day if you don't cook much at home, the office environment is really open and collaborative.
Cons
There's a lot of growth and much going on so you can have a lot of impact but you have to be able to adapt quickly to change.