Pros
I enjoyed getting mechanical engineering experience in the analysis and design of centrifugal pumps. Since the engineering office is in the same building as the manufacturing plant, there are plenty of opportunities for an engineer to look at actual parts in order to understand better a pump design.
Cons
Flowserve is a large company that has grown through acquisitions of smaller companies. Although the small companies are now under the Flowserve umbrella, they still function as what they used to be before they became Flowserve. This hinders collaboration between Flowserve plants because they still view each other as competitors. Moreover Flowserve has a less than desirable work environment. Often times meetings are scheduled and the meeting organizer never shows up. This is highly unprofessional, and a red flag that something is terribly wrong. Finally, there is a mentality of "we've always done things this way" that does not welcome engineers coming from an industry other than the pump manufacturing industry.