I may be in the minority, but I want to share my opinion...
We did not do a private class, but I was quite unhappy with my experience. The drinks were made and passed out during the first few minutes of the presentation. The only one that was okay was the mojito. I think there was a Tom Collins too that wasn't too dreadful. The other three were terrible. Definitely no appletini, shot, or mai tai.
We were on the Wonder and I could not understand the man who was doing the presentation. He spoke very very fast and had a very thick accent. One person asked if we would be mixing any of the drinks and the guy said it wasn't allowed? We had less than 20 people in our session.
The space where we had the event (Cadallic Lounge) was boiling hot and the drinks were sweaty from the git-go. We were between two other couples who were also greatly disappointed with the event. We ran into one of those couples later in our cruise and they had complained to Guest Services and ended up getting a refund and a note of apology in their stateroom. We just figured it was $40 wasted and moved on.
I would not do it again. Next time, I might try the wine or champagne tasting, I've heard good things about both of them.
Not to be a Debbie Downer, but just wanting to share our feelings. I'm glad to hear others had better experiences, maybe it was just a rough day for our folks.
I hope you have a super cruise!