Pros
To learn new systems and get experience in various therapeutical areas. There are a vast amount of opportunities to expand ones knowlledge. also you get the opportunity to monitor in every aspect" Site initiation visits, qualification visits, monitoring and termination visits. If you were not familiar with EDC, Parexel will evenrtually train you. They have an excellent training program that helps to freshen your memory or train the beginner.
Cons
No control over travel, company politics and so many administrative systems. You don't have much time to learn them and there is not much of a learning curve. Also many times yu are thrown inot the middle of a study with know training, not even the chance to shadow or co-monitor with someone more knowledgable. Also parexel will utilize you to the very end even when they know they will fire you. Parexel has fired many people I trained with and they all felt they were set up to fail.