Pros
CHS has a wonderful corporate office, a good culture, and strong financials and benefits. The 401k, pension plan, and medical insurance were far better than you can normally expect (mostly because they are a co-op). The business units are small, and there isn't a lot of cross-work with other business units, so if you like being focused on your primary responsibilities, this is a good thing for you.
Cons
The business units are completely closed off--you're not going to be moving horizontally within the company anytime soon. Management power is retained at the very top--managers within business units are unable to give you guarantees about salary, promotions, etc. Mid-management seems to lack focus, at times. Strange corporate policies that are not enforced company-wide. Salaries are lower than elsewhere, but that's because the benefits package is good.