Pros
Dynetics has a huge variety of tasks. With the integration with Leidos, that is only increasing. And, at least in several departments, it doesn't seem at all like you are pigeonholed into anything unless you just don't go looking for more work to do. And there are adult rules. For the most part, managers want you to put in your hours and do what you say you're going to do and they will be happy and flexible with you. I realize I don't speak for the entire company, but most people I've worked with have been professional on their end, and have received flexibility and recognition from their coworkers and managers. Seriously though, I have really enjoyed working here, and as long as there's good work and compensation is good I'm happy.
Cons
Current employees have a lot to say about the way benefits are changing. For instance, if you have a spouse who is working and could receive health insurance at their employer at non-Leidos (or Dynetics) company but they want to be on Leidos benefits, there will be a fee on your plan for that.