Pros
I worked with a great, diverse group of people who were always friendly and helpful. My manager was laid back (but strict), and approachable. Training at Quintiles was also great. We also had the option of working from home a couple times a week, as well as when the weather was bad which is always a good thing. Pretty good benefits.
Cons
Pay is LOW, LOW, LOW, and you are constantly reminded that you are bottom tier by the higher ups. Once you get 1-2 years of experience, leave. Quintiles has a good training program, and will provide you with a wealth of clinical research knowledge while working there. Unfortunately, it is extremely hard to move up from CTA (only laterally, and then up). Other companies will snatch you up once this experience is received, and offer you more money than Quintiles ever would.