I have never stayed at La Siesta, but I do know the property. It is on a beautiful site. The owner is a developer who is planning on turning it into a luxury place, so I don't think they are doing too much to upgrade.
I have recently been out with Key Dives at Bud and Marys. As a newer diver on new sites, I really liked it. New, beautiful boat. Crew required structure, but were pleasant and enthusiastic. For each of two dives, a dive master led the divers (There were 8 of us.) For an experienced diver, I can see an objection to an assigned leader, but I really liked it. We dove the Eagle and a wall and I considered it one of my better diving experiences, within my very limited dive history.