First, this tour company organizes small group excursions on the reef which is a very thing after having tested other larger boats in Cairns. You will appreciate the personal touch added to it, especially if you are new in snorkeling/ scuba diving. They may not go to more remote reef locations but it doesn't really matters because where they go, Michaelsmas Cay and Hastings reef, there is plenty to see.
The team is great, very helpful, funny, and makes you feel good and confident.
SeaStar was our best reef tour.