Pros
Emerson (referring especially to the Fisher brand in Marshalltown) is an industry leader with a lot of impact. It can be fun to be a part of that. Benefits compete with other similar-sized companies. They have an unlimited sick leave policy, meaning you can plan out your vacation days without worrying about getting sick. 3 weeks vacation to start with a good number of holidays, insurance options, etc.
Cons
Emerson is a large company and moves slowly. At the Marshalltown campus, there is a lot of internal pride for the Fisher brand, but some resentment for the larger Emerson corporation. Emerson mandates HR/benefit changes company-wide that frequently are worse than what Fisher previously offered. There is a lot of routine training employees have to do for legal reasons, most of it a waste of time. Because Fisher has been around for a long time and it is involved with potentially dangerous products, there are lots of complex and ambiguous projects, making them take much longer than they need to. Promotions are given based more on years of experience with Emerson than ability or contributions. Evening/early morning calls with partners overseas.