Pros
MongoDB is an incredible place to learn the art and science of sales. If you are truly interested in sales as a career you have the opportunity to learn a tremendous amount and work with very talented people, and if you get good at it, there's a lot of money to be made.
Cons
MongoDB has had some difficulty with promoting in the sales organization, if you want to get promoted you really have to blow it out and navigate the politics of the company. It's also fairly cut throat if you don't perform the leash isn't too long. If you are not committed to becoming a great sales person and are unable to sometimes put internal politics aside and focus on selling I would not suggest coming here. If you want to kill it and learn a lot this is a great place.