We had a great experience with Scott and the Sirenas team over the Christmas holidays!
Our group had a variety of experience levels from Open Water (~10 dives) to Dive Master. Scott and his team did a phenomenal job making sure that everyone felt safe, comfortable, and got the most out of their dive experience. Not to mention, they took us to some amazing secluded beaches during the surface intervals.
If you are going to Costa Rica and want to ensure you are diving with a professional who prioritizes safety, Scott is your guy. He is also incredibly quick to respond to emails, which makes planning easy.