We took Ramsey's "Financial Peace" class through our church and were not super-impressed. While there were a few items of note that we learned or that were helpful to us, as a whole it was not worth the $100 that we had to spend. (We thought it was ironic that his company would charge us a large amount of money so that we could learn from him how to save money. Plus, the software included with our kit does not work on Macs, which we have.) Overall, while it wasn't a total waste of our time, it wasn't something that we really got a ton out of. Plenty of the topics he covered were not even relative to us, either, so those weeks were a waste.
I know people who really are devoted to him and his ways, though, so maybe it's just personal preference.