Are Childbirth classes worth going to?

FTM here and my hospital has only one spot left in their Childbirth class which happens to be 1 week before my due date.  I tried getting other moms to switch with me to an early class but no luck.  I'm 35+2 days and really can't picture myself sitting through an 8.5 hour class at 39 weeks.  Is this something that is really worth it?  Will I miss anything important that I can't find out through online tutorials?  Thank you!

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