i did the classes at Matilda and wouldn't recommend it.
the classes run for 6x 2hour sessions over 6 weeks, but i felt they were dragged out and could have easily condensed it to half the time.
also half of the sessions were run by a nurse educator who WASN'T a midwife, which i'm not sure about what other people thought, but i thought was inappropriate as she was teaching us about labour and delivery (and she herself wouldn't have delivered many babies).
the only good thing about their classes is you get a tour of the labour ward - but you can arrange this without having to do their classes anyways.