Pros
As a very young professional, I was given insight into various companies' operations that many people do not get exposure to. I was constantly learning, and never felt like I had time to master any one thing. This job set me up for success at my next job, and what I learned these first four years of my career, I know I'll take those lessons to all future employers. Overall, the exposure you get at KPMG is second to none. Also, I enjoyed most everyone I worked with. There were a lot of like-minded people at the firm. I was given a lot of praise, which felt good.
Cons
The pay. It is just so far below market that its hard to justify. I don't mind grinding at work, but I would like to have been compensated for it (other than in "learning opportunities".