I did find it helpful to attend, but it does depend what they cover. It was useful to know exactly when to go into hospital, what to expect while there. We did do nappy changing, bit of first aid, how to know when baby is hungry. But I will say nothing prepares you for the reality, but it did stop me freaking out.
My only concern with the internet is working out, what is quality information, what is just biased nonsense.
Being fully informed about the benefits and downsides to each type of pain relief is crucial, and best coming from a credited source imo.