Pros: The customers run 24/7/365, Engineers really have impact and are expected to know what they are doing, It's a young, high energy environment.
Cons: The customers are demanding, They expect a lot and the engineers are the ones doing the work, you need to be willing to work hard.
Open Systems is a challenging place to work. Their customers are electric utilities who use their control systems to manage the power grid. this is challenging from a security perspective and operationally. A good engineer works hard and learns a lot.