Pros
Decent salary and good benefits. Headquarters is near Boston, MA. You can get great experience managing programs and performing on government contracts as lead investigator. Dominated by engineers, so this is good if you are one.
Cons
The company is poorly managed by some people who have never taken business courses or worked elsewhere. Their business model is to obtain government grants, develop a technology, and license the IP. Their 'products' are very limited and specialized for government as the end-user. They have no interest in production for a commercial market through a pilot plant. High overhead rate for type and size of company. Not good for scientists. Consider them to be a perpetual start-up with increasing competition from university spin-offs.