I have been out diving with these guys several times over the past few years. They are a mom-and-pop operation, operating out of a little hole-in-the-wall shop near Mala Pier. They don't have a huge boat, but the upside of that is that it's not a "cattle boat". They treat their divers well, and definitely follow the saftey protocols as they should.
They regularly head out to the Cathedrals and have a great open-water location frequented by hammerheads. I have done the Cathedrals twice and the hammerhead site once over the past three months. Abbi, Pascal, Jeff and the boat captain, Steve, treat you right. Highly recommended!!