I guess it depends what kind of classes you are interested in. I'm not sure what kinds of types there are, but you could check out posts (and ask) on the "Private Childbirth Recommendation" board:

https://www.bellybelly.com.au/forums...commendations/

Me, I wanted to do a Calmbirth class, because I've heard good things about that and hypnobirth, which I gather is similar. But I also want to do the hospital classes so we know about the procedures and so on at our hospital. I figure that for us, the more we know the better.