We dove with Hugh Parkey's as an excursion on a cruise Feb 06.
I should qualify this by saying we have never been to Belize on any other occasion, but this operation seemed well run. In fact, it was the best diving experience of the cruise we had out of the stops in Cozumel, Roatan, and Belize. They kept 4 divers to 2 DM's. The lead DM would guide the group to 'something' and the rear DM would leapfrog ahead and tap on his tank when he found something. It kept you moving from one DM to the next. The DM's also used under water etch-a-sketches to write down what it was they were showing you. "Drum" or "Spotted Eel" would be displayed as the DM pointed to the subject.
On board the boat, the crew made a point of having you relax and let them to the work for you. It was a very nice experience. Rental gear is a little dicey. The guages were off - my wife's showed 80' mine was at 65' and the computer we used showed 70' - and I had a tiny leak where the regulator attaches to the tank. That type of equipment was consistent with all the locations (Cozumel, Roatan, Belize) be dove on the cruise - a very real exercise in why it's a good idea to buy your own equipment. They also had a lead fish tied off 15' down on the anchor line so there was no guessing as to where your safety stop was.
I don't know much about the resort itself, but a couple we were diving with said they stayed there for a week the year prior and loved it for whatever that's worth. You can probably find a lot of posts about it by searching this site.
Hope that helps a little.
Chris