Ventajas
The people! I enjoy hanging out with my co-workers and collaborating on projects. There are amazing advancement opportunities for environmental engineers that you don't see elsewhere. It's definitely is a corporate environment, but you see the benefits of that (more exciting job options, great benefits, one of the best company brands in the world). We also have great IP, and some of the strongest technology.
Desventajas
It can be slow to get things done but there's a lot of effort focusing on continuous improvement, lean work processes, etc. It's a great place to stay for your whole career, or at least 5-7 years. This may make it a perfect fit for people interested in that/but a turnoff for those looking for start up/risk taking culture.