Anyone take Cozumel Cruise Excursion snorkeling tours

Has anyone taken one of the snorkeling tours through Cozumel Cruise Excursions? We're thinking of taking either the "El Cielo & Snorkel" trip or their "Cozumel Snorkeling Tour".

I'm curious to hear what others thought of this excursion. How were the snorkeling locations and staff? What types and conditions were the vessels? Did the excursions leave from Cozumel, or do you need to take the ferry to Playa del Carmen?

Any information would be welcomed. Thanks!

Bump. Anyone? :)