Pros
Wilson Elser offers an excellent opportunity to gain professional experience if you: a) have recently obtained your bachelors degree and wish gain legal experience before deciding on applying to law school, or b) wish to have a career as a paralegal but do not yet much professional experience. Your experience will vary significantly based on which practice group you work with. If you are put in with a good practice group, you can have a very positive experience.
Cons
There is limited room for growth as a paralegal, ie there was no opportunity to be promoted to a more senior position after several years on the job. It seems that the firm prefers to hire entry level paralegals, allow them to leave after a few years (due to lack of incentive to stay because of limited room for growth), then replace them with new entry level paralegals. The constant turnover can make the work environment hectic.