I did it last year. As far as the classes are concerned, you are in class basically from 8-4 every day. You take biochem, physio, and anatomy as the primary science classes. Then, the rest of the day is filled up with different guest lecturers.
The best part of the program, however, is getting adjusted. You find a place to live, you learn how to get around the city, and you develop friendships with just about everyone in the program. Socially speaking, its a good deal.
There were about 45 kids that signed up. I would say that just about every one of them was grateful that they did it. If you have those 3 weeks open, then I would highly recommend doing Excel.