Pros
You can become an experienced CRA within a year or two and get acknowledged with international standards of clinical trials. Intense travelling is good for those, who like to be occupied. If you're lucky, you may come across professional managers and learn a lot from them. If professional growth is a priority for you, it is a good place to go.
Cons
Managing work-life balance is challenging, especially for non-workaholic people. You can easily get a phone call from your manager outside of working hours or days. It is expected that even on vacation, on holidays, on sick leave and of course on business trip you're available. It is quite useful to have connections with the right people, if you want to receive a promotion. Your relations mean more than professional skills. Also, participation in amateur performances is very much appreciated.