Pros
In general you will be working 12hr rotating shifts. Some day shift jobs are available, but they can be hard to come by. Safety seems to be a main focus and new programs are showing up. Pay has been increasing to compete with other places as well. Your standard chemical operator position will be a rotation in field operations and control room monitoring of equipment and process pipelines. Expect lots of stairs, general area rounds, equipment purging and line breaks.
Cons
12 hour rotations can be taxing on your family life or weekend hobbies. They can be extremely long and mind numbing or long and hectic. Management can seem to be a revolving door of candidates and ideas come and go. Some ideas and rules seem to repeat themselves. Other cons are that you must realize you are working at a chemical plant, so there are dangers here that can cause bodily harm to you and coworkers verses other opportunities with similar pay and benefits.