Pros
If you get hired in to management and fit in to the clique, you're golden. The company is good about bringing interns in, and has scored some good results. It would be a good place to start as an intern, since there's a chance you'll fit in with the clique.
Cons
This company was a dynamic start-up just a couple years ago, but quickly became any other company. For anyone that has worked with NASA, you will know this to be true: it's very top down. The management makes decisions that the engineers are supposed to sign off on. Sidus is exactly like this. There is a small clique of people (and not necessarily engineers) that make technical decisions. Others, qualified or not, are strongly discouraged from contributing. HR has brought in toxic policies from their former company to encourage older employees to leave. The owner of the company is impressive in her drive, but her company is being sapped by those she trusts.