Harvest Caye Snorkel Excursion

Thinking about booking the snorkel excursion that is now being offered from HC, when we visit via the Oceania Riviera in Jan 2019. It is my understanding that this a relatively new excursion offering, and I am looking for feedback from anyone who has taken this excursion. Trying to decide if we want to give it a whirl. DH and I are experienced snorkelers, and our experience on snorkel excursions via other ships in Belize has not been great. We have had superb snorkels on an extended land trip to Belize a few years ago, especially via dive boats out to places that take awhile to get to such as Glover's Reef.