Pros
Plethora is at a stage where the seeds that were sown early on are starting to bear fruit and move toward solid, scalable products. It's a highly creative environment engaging many different kinds of thinking during a given work week. Technical challenges straddle computational, mechanical, and material domains. How these are met requires broad strategic thinking from a production and business POV. Given the evolving nature of such a complex and nascent product, a proactive approach will be richly rewarded in that you will engage many different ways of trying to solve the problems at hand, which is extremely rewarding.
Cons
No organization is perfect. These are challenging problems and there are growing pains. That said, part of the fun is meeting the challenge and seeing hard work pay off.