Pros
The best reason to work for MITRE is the job security and the flexible work schedule. Job security is based on the fact MITRE has rarely if ever had a layoff. MITRE is limited by Congress as to how many engineers they can provide to clients. This limit is always smaller than the client requests. So there is always demand for MITRE support. This provides security. MITRE policy is that the worker must put in 40 hours of work from Monday morning through Sunday night. So as long as your supervisor and client go along, the worker can flex hours as needed.
Cons
The assignments can be confusing and unrewarding because of the client we work for (Fed government). There is an arrogance to Federal workers that the world revolves around them. They do make the decisions but many are not open to looking at facts. They have their own private views and reasons for doing something, so they disregard other inputs. Many times I can see problems coming because of 29 years in engineering, but am ignored and end up having to fix something that could have been prevented. The biggest disappointment is that the warfighter suffers with less than the best equipment and the tax payer suffers because the costs run out of control.