Amberdee,

I never attended any, because when I went to the initial meeting/booking in this pompous older couple were so self absorbed & totally talking crap, that I snuck away & decided I'd manage without having to see them again!

When in labour with #1 the 2 midwives said "You remembered a lot from your antenatal classes!" I said I didnt attend any, they laughed & said, The womans body doing what it does naturally!
About 5 or 6 other couples I know also didnt attend & were commented on the classes again, when they said they didnt do any, the nurses often said 'Women's bodies KNOW what to do & also many women try to make theior labour like that of the class, videos etc they watched, when EVERY labour will be different"

I dont think you'll have missed much! But thats'my opinion...