My husband and I took the class for our first two children and I would highly recommend it. We didn't for our third, because after having been through it twice already we felt prepared. We just reread the workbook for a refresher. The two most important things the class covers are education - knowing what to expect and what is happening at the various stages of childbirth. Transition is the most difficult stage (in terms of pain), but it is also usually the shortest. That is usually when a lot of women wind up asking for an epidural and I could see why. But since I knew what was happening I was able to make it through. I went drug free for all three girls (8lb 7oz, 8lb 8oz and 9lb 15oz). The other big thing in the class is teaching the husbands and making them your advocate. I delivered the 2nd two at St. Vincent Carmel and they were very supportive. If you need a recommendation, I can direct you to someone in Carmel who is an instructor. I believe in it so much myself that I have considered becoming an instructor myself - just difficult finding the time with three girls under 6.
I needed to add something after reading some other responses...Bradley and Lamaze are not the same thing. The goal is the same - to have an unmedicated birth, but the techniques are different. Lamaze is about how you breathe, but Bradley is about relaxation techniques and educating yourself.