Pros
There are many opportunities to improve the health care delivery system at Kaiser. The organization - and this refers to the "corporate" functions - is well aligned around the importance of delivery of care, and improved health outcomes, to all patients. It can be really great to feel part of such an important mission, and to see the potential for a working model of health care delivery that is better aligned in its incentives than most of the industry in the U.S. Retirement benefits are excellent, if one stays for at least 5 years. (Kaiser still has a defined benefit plan, in addition to a 403(b).) At some point (maybe at 10 years?), a retiree gets health care coverage for life!
Cons
Most of the "corporate" executives have learned that they need to self-promote and protect their own interests in this highly-political environment. When moving beyond areas that directly affect the delivery of care, the politics of self-interest and turf seem to take over. It can be extremely difficult to get the right things done for Kaiser Permanente as a whole, because one must balance the frequently competing interests of the individual executives. Because of the longevity of Kaiser (over 50 years) and the traditions behind that, as well as the political climate, change is difficult to make happen - even when there are really compelling reasons for it.