Pros
The workplace culture, at least in my group, is very supportive and collaborative. I've never felt like I'm in an intense competition with my colleagues, as work at some other consulting firms can feel like. The company also provides generally good benefits, including two health insurance plan options, 401k with matching, and an ESOP. The company also pays pretty well, and from what I've heard has managed to avoid cost-cutting layoffs entirely throughout its decades-long history, even during the most challenging economic times. This shows me the company is overall very fiscally responsible and values its people. There are also good opportunities for advancement within the company, and they tend to promote people fairly based on performance and individual readiness for higher positions.
Cons
Because it's a consulting firm, there is a lot of pressure to always be doing billable work and reach a certain utilization goal. That's the nature of a consulting job, but it does lead to stress that I have not experienced outside the consulting sector, particularly during periods of slow work. The company also generally does not offer as much paid time off as my public sector counterparts tend to receive. I get less vacation time, sick time, and holidays than I used to in the public sector. On the issue of holidays in particular, it always feels a little odd to be working on holidays that our clients (who are mostly public sector) have off and probably don't expect us to be working on either.