Pros
Stellar is a company with great people and great benefits. They have a flexible PTO plan that lets you work more and earn more money or take more time off and earn a little less. I never once worried about taking time off if I felt like I really needed it. Their 401k is with Vanguard and they make large contributions which will have you set for life if you stay there for the long haul. I also really appreciate that, no matter how long you've been with the company, you get the full benefits package; you'll be treated like you've been there for years from day 1. Despite being a junior employee, I never once felt nervous about approaching senior management to chat or share my thoughts about the company. It's got that intimate start-up feel despite pushing 200 employees.
Cons
Stellar is currently experiencing some growing pains. One issue which still needs to be ironed out is retaining and developing junior engineers. They do their best, but sometimes the opportunity to land a dream job project just isn't there. I ended up leaving because I found a job that will set me up better for my long-term career goals. The other issue is that, since they typically act as subcontractors, the employees are pretty scattered across the country. It can be frustrating when somebody you'd like to learn from and work with is on the other side of the country.