Pros
Great people and a great product. You'll have access to a ton of resources to be successful, but it will require focus and it won't just "come" to you - you'll have to jump in, and Box does a fantastic job of recognizing and supporting you when you do. You'll be exposed to all kinds of use-cases and customers, good and bad, that will push you to the next level on a professional, technical, and personal level. Lastly, Aaron is as great of a leader as they come - he's as honest and transparent as you can be when managing a public company.
Cons
It's not easy - understanding the product, aligning it to value based use-cases, engaging with customers, finding the right internal alliance - it's all hard, and can be a challenge if you're remote. The pressure from competitors exacerbates all of this as well. Box is the outright best product on the market but it's also 2x or 3x the cost. We can lose focus sometimes as a result of external pressure but if you have the right attitude and perseverance it will be worth the ride.