http://www.pinkbike.com/video/23890/ Not my video, just one to demonstrate what it does.
It is built so that you can cary a tonne of speed through the turn to set up for the drops after it.
Midway through my riding session on it today, the dirt on the exit of it became really sloppy and the bike slid out from under me as I was getting airborne off the bump on the end of it.