We're going at the end of July. I've only been able to find one review so far and it was on trip advisor:
"We did the cake decorating on Mother's Day. It was so much fun. All the hard work is done. The instructors were funny and engaging and the servers were kind and sincere. It is a little expensive but so much fun and you can have Bellinis and Mimosas. Fun to experience once."
So, it sounds like it is a fun activity. DD and I are going. The reviews for the desserts themselves are all good. So, I guess no matter what at least we'll end up with a good tasting dessert!