Just wondering what kind of childbirth classes people attend or recommend?

We're doing the usual one that they do at the hospital where I'll be giving birth and I have done a yoga course (which included a chat about the birth, preparation etc at the end of each class), but I am wondering if I am going into it blindly?

I don't want to spend a fortune doing lots of different classes that may confuse me, and whilst I want to be prepared I think a little bit of ignorance can help you not to freak out.

I would like to approach the birth I think the same as alot of people, try to go as natural as possible but I don't want to be dissapointed if I arrive at the hospital screaming for an epidural because I've no idea what I'm in for.

I hope this makes sense, any advice that people can offer...maybe what classes they did or didn't do, what worked for them etc?

Thanks