Hey Dtreid:
My husband I and just got back from Wananavu in April where we did some diving and got married (notice diving first, married second).
We had a pretty good experience with them. Diving was good every day, they were considerate and were available for everything that we needed. One thing of note is that we were a group of 5 total divers. While we were there, there was also a few groups of 2 as well as a large party of 8+. Many of the divers will take their belongings back to their bure/room, while others leave things on the boat and leave things in the dunk tank/at the shop to hang dry. One of our party had her wetsuit at the shop to hang dry on the last day and it wound up missing. RA divers was very quick to pay her full cost of her wetsuit that went missing (in US dollars). There was no "maybe you put it here..." or anything like that. They were good and responsive.
RA divers is not affiliated with Wananavu. They just operate out of the resort. So, the communication isn't 100% perfect. As long as you remember that you are on vacation, that you'll be diving, and you are relaxed, it will all be fine. We had one instance that RA told us that we'd be diving in the AM, and it turns out that we were going to dive in the PM. Not that big of a deal, but it was a minor hiccup.
BTW, Wananavu is GREAT. All of the staff there is excellent, food is terrific, rooms are beautiful and clean. No complaints and we'd go back in an instant!