I don't have first-hand experience, however three of my former co-workers used Cheetah Learning, and they were 3 for 3 on passing the PMP exam first time up - they scheduled it for the last day of the training, which was a half day). Hope this helps.

Bob, PMP

It was a bit expensive.. but here is a chart comparing some of the bigger names out there...

http://www.truesolutions.com/Why-Buy.html