I haven't used it yet, but DH and I did take Bradley classes this time around. Mostly, I wanted him to know what to do to support me during labor! Plus, he never takes my word for anything, so having an "expert" (our instructor) talk about all the interventions and things I am so dead-set against happening this time around really helped him see my point of view regarding childbirth.
I highly recommend it, unless you somehow have one of those very few and far between partners who automatically and instinctively knows what you want him to do, and does it, without you having to say anything at all.
Anyway, DH was far to scared and uninformed to be any help to me at all during the birth of our first daughter. I wanted to make sure things would be different this time, and taking Bradley classes was just one of the things I did to make sure that what happened before would never happen again.