Pros
The Power & Light office location, and the physical office itself are both a huge draw. Presents very well to prospects and those looking to come on board as an employee. Most, if not all, of the team on the front line that I worked with were truly good people. Unfortunately that isn't true up the ranks.
Cons
The grass definitely is not greener on the other side. Commute to/from the office is a bit of a pain. Parking is expensive and not covered as a benefit. As noted by previous posters, how many firms do you know have an active reputation management practice? That really says it all about DSI. No work / life balance. Expect to be on 24x7. The inside joke is PTO is Pretend Time Off. Unfortunately it is not a joke, it's true. Constant changes in direction, messes with both corporate and personal success. You'll receive little or no career progression opportunities or salary adjustments and may often find yourself in a role that doesn't meet your skill set or career desires. And give it a few months, your role and manager will change. Don't expect much feedback on performance, unless you do something perceived as negative. In all my years there I received very few quarterly reviews and they were subjective and inaccurate, used solely as a chance to beat me down. Get your variable compensation plan in writing before you accept an offer. They didn't do it when I hired on, nor for anyone I knew who came on after me. I was under a verbal plan until 12/31 of my first year there and subsequent years a plan was mentioned, never formalized and never paid out.