We got certified with Off The Wall divers in 2004. It came highly recommended to us by coworker who dive twice a year at the Caymans, and it's true that it’s a small op that runs personalized service. We communicated via phone before we left US, the boat always shows up on time, and it only had 6 divers max on the boat while we were there. Since we are certifying at that time, Danny allowed the other experienced divers to go off on their own after the briefing/get whatever bottom time they want to get while I get more "baby-sitting" from him (that was my first open water dive ever). Since I was a beginner (air hog!) I would always finish first and waited on the boat until the other divers showed up. One of the diver were diving Nitrox and I remembered Danny check his gas mix everyday. We dove the North Wall when the weather was good and stayed on the west side otherwise. Divers could request dive sites and Danny would manoeuver the boat for you, as long as weather permits and another boat didn't take up the site yet (obviously I had no idea the sites in discussion so I just went along with everyone else). Danny also had no problem telling me what I was doing wrong on dives too, which I much appreciate - now that I have been diving a bit more you will notice al wroundathe world a lot of DMs avoid educating guests on safety/etiquettes for the fear of offending them (don’t crash into reefs, stay close to your buddy, don't touch anything etc). He basically trained us to the point where we know how to navigate underwater and he let us go off on our own after briefing (just one week of diving). Pretty incredible considering I was so nervous on my first day of dive that I threw up during the surface interval (and the sea was calm as glass that day!)
Have fun in GC!