Pros
Progressive gives very thorough training for someone entering into the claims career. If you are willing to relocate, there are always lots of opportunities for advancement, in claims or other departments. The work environment was good for the first half of my tenure with this company, but then when the department manager changed, the environment became increasingly negative.
Cons
The turnover rate for claims is very high. During my 2 years there, I saw at least 20 people come and go from a department that has about 25 people in it. You will be expected to work 50+ hours a week, without overtime pay. There was one day that I was assigned to a training class that lasted for 7 hours. When I got done with that class, I went back to my work station and saw that I still had been assigned a full days worth of claims that I had to work. Don't join any group or league for the after-work hours. You'll never be able to count on making it there in time (unless it's after 9pm).