prenatal classes?

Okay so I'd like some feed back from those of you who have done some prenatal classes, the ones offered near me are prenatal that cover birthing classes and then there's another class you can take for breastfeeding. I am currently 21 + 3 days. I would like to go to both of them, just want some feed back on if they are helpful cause I will have to take days off work to go to them and I don't want to if they are a waste of time. Thanks in advance ladies.