Pros
At the Decatur site I have found the people to be supportive and friendly. Engineers and support staff do a great job of responding to requests quickly and not building a backlog of important tasks. Managers do a good job of avoiding overloading their engineers or having unreasonable expectations. Ascend offers much more vacation time than other employers do for entry level engineers. I work a forty hour week and then I get to go home, you can't underestimate that value to your life outside of work!
Cons
As a growing company, there are still plenty of reminders of Solutia, the company Ascend bought out. Also since it isn't a well established company yet there are always concerns that your job is not stable, but the management are usually optimistic and reassuring.