Pros
Exposes you to PR industry, is a paid internship, boss is a great mentor, teaches good over the phone and email communication skills from pitching, company event in NYC every fall for employees and clients with all expenses covered and great for networking.
Cons
No full-time opportunities after (internship only), work can become mundane easily at times and the boss is tough, but it's good because she rewards and affirms well from learning from mistakes and actively improving.