I liked my NHS classes, we had 6 x 2hr sessions on a Monday evening and dads were more than welcome. Each session had a different focus and was a mix of talking, practical, and Q&A.
The first session was about labour and delivery, when to go to the hospital, delivery types, etc. They even had props! A shoebox lid with a 10cm tights-covered hole cut in it. They gradually pushed a baby doll (complete with a fabric placenta) through a slit in the tights in time with contractions, showed how the head turned, etc. Then they showed a ventousse delivery and a forceps delivery - the ventousse was a small plastic plant pot and the forceps were huge salad tossing forks. They discussed pain relief and the pros/cons of each method and caesareans. All of the community midwives have ha babies themselves at various points so they were also able to say from experience how they found the different types of pain relief/delivery. They asked which hospitals were in the group (there are loads in our area but generally only three are commonly used) and gave descriptions of where to go to get into the maternity department depending in whether you had to use the day or night entrance and a run-down of the facilities at each.
Second session was post-delivery, the post-natal ward, and the first few days at home.
Third and fourth sessions were positions for labour, massage, and breathing. They got a physiotherapist to come and show us lots of positions and things dad/birth partner could do. These two sessions involved lots of practice with partners rubbing backs and trying out all of the various labour/delivery positions and doing all the breathing too.
Session five was about birth plans, options, and choices. It was all presented fairly impartially and there were lots of opportunities to ask questions.
Session six was about your own post-natal care and recovery, healthy eating/exercise, warning signs of post-natal depression, etc.
There were also optional three hour seventh and eight sessions solely about breastfeeding.
I would speak to your midwife to see what their classes cover and what sort of feedback they've had about them.