Pros
You will receive a significant amount of experience in terms of written discovery, deposing parties and witnesses, and working with expert witnesses once you have been around long enough. You will acquire a significant amount of arbitration experience as well as some medications. If you would like, you can place yourself in a position to obtain a significant amount of jury trial experience.
Cons
You will lose your mind. Although you can gain all the above experience, it will be obtained - everytime - without fail - through the annoyance and pain that is being micromanaged and Monday morning quarter backed. You will receive zero formal, official training. You will be provided, at least when I last worked around 2020-21, with an unsustainable workload. You will have 80 BI cases. You will be expected them to "close them quicker" yet be armed with lowball offers to try to resolve the case. You will try to keep up with the work, but that means you will be working nights and weekends. You will not be able to type quickly enough to fill out all the reports and summaries that are necessary for you to hit your metrics. You are expected to obtain excellent reviews from customers, despite the fact that the only acceptable score is a 10/10 and customers (1) have no idea what you are doing (2) don't understand that sometimes cases just have to settle (3) they may mark you down for an entirely illogical, irrational, and non legal reason such as "well now my rates are going to go up" or "I know the guy wasn't injured badly." You will have good and well intentioned immediate supervisors and supervisor's supervisors, but they will have no choice in what policies they may or may not enact because they are being managed by individuals who have no idea what it's like to handle a single case, let alone 80 cases which run the gamut from long term soft tissue to death. Oh, and you will also no longer receive a profit sharing bonus.