Pros
RP's training-intensive approach to the summer internship program enables interns get past the initial learning curve quickly. The experience is very hands-on, with interns getting various opportunities to work on challenging tasks that a full-time analyst might do, while also introducing related job functions that help you develop as a well-rounded professional.
The quantitative nature of the job helps develop, and offers the chance to apply, analytical, critical-thinking, and problem-solving skills and the interactions with other interns, analysts, and senior management help develop much needed soft skills.
Overall, the internship program is structured to help you succeed, which is further strengthened by the people around you always willing to help.
Cons
None - I had a wonderful experience and only have positive things to say about it!