Pros
There is a wide variety of high quality projects; better than many consulting firms. Being a consulting firm, you get a much greater variety of types of projects as well as areas of engineering expertise. You will furhter your skill sets in many different areas. Overall the people are great to work with. I find the work/ life balance to be very good. The key is that you are responsible for your work. This isn't the place for you if you don't want to own responsibilities and deliverables. If you are open to responsibility, the project managers are fair and reasonable.
Cons
As with any consulting firm, you are responsible for tracking your time/ billable hours. That being said, Cirtec is fairly reasonable about non-billable activities. Because billable hours run the company, it is harder to do in-depth trainings. Basic trainings are encouraged and supported, but a multi-day event would be hard to come by. As with any consulting firm, you can have lulls that make some people uncomfortable. Currently very busy with more interesting projects on the horizon.