Pros
Invests into their student interns both financially with good pay and matching 401k. They pay according to the number of credits you have completed at University, so I was paid at a senior salary from the beginning. We were able to have security shuttle us to UCSD from work and back again so you didn't have to pay for an expensive parking permit. They had a little training program to show you how drugs are approved. They had a company store where you could buy Pfizer consumer products for cheap, but since then they have sold those to J&J. Greater location with Happy Hour every Friday with a good selection of beer, good pizza, wings, quesadilla.
Cons
If you work there long enough like any other job, you will start to have repetitive tasks, which can be alright given you are an intern who is there only part time. However, if you have a good boss they can help you use top of the line equipment to automate certain tasks. There is some decent mentorship of trying to do independent projects as well as normal job functions.