My oldest sister did a fellowship with them. I wish that I could give you a glowing report of how exciting it was. It did sound exciting and interesting when the offer was made.
She'd been there around 8 months when they offered her to extend her year for another year or two. Instead, she asked to be released. She couldn't stand to think of spending any more time doing practically nothing. She did author a few papers while she was there, and made a few trips to do presentations, but it was all from work that she created for herself while waiting on her assigned department to give her anything to do. The first months were particularly bad. She had a desk, but nothing to do. Nothing that was supposed to have set up before she arrived had been done. (She had her MPH in genetic epidemiology.)
What this shows is that although it can be an exciting and fruitful experience, it can also be a great letdown. A great deal depends on the supervisor and area to which you are assigned.
