Pros
You can have a job for the rest of your life. The pay is generally fair market. The culture is difficult for a lot of people to get used to. Most people have worked there for >10 yrs and it is the one and only job most employees there have ever had. I suppose this is a con as well because folks are set in their ways. Great work/life balance (for most positions) and flexibility for mid level/experienced/senior positions. Very concerned about customer service even though it is an oligopoly.
Cons
Poor performers (dead wood) are rewarded with the same raise as good performers. SRP rarely fires people. Most people have been there >10 yrs and it is the one and only job most employees have ever had - hired right out of HS or college and never leave. Not for profit so "it gets done when it gets done, it takes as long as it takes, and this is how we've always done it". New experienced hires will pull their hair out trying to change the culture. Very risk averse and slow to adopt new ideas or technologies.