I posted this last week in another thread
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I dove in Grenada in October 2006. I stayed a True Blue for about a week and dover 3-4 days with Aquanats. I thought they were very professional and ran a good dive operation. The crew and dive guides were friendly and helpful.
I like True Blue as a hotel -- nice rooms, relaxing atmosphere. I would recommend going elsewhere to eat though. The restaurant was average and the service not great -- below average all week and then topped off by an unpleasant incident with the way they treated our liveaboard group during our last night dinner. It did not seem that they could have been run by the same friendly people as the hotel.
I dove for a week on the Wind Dancer in Grenada and the Grenadines. I enjoyed the diving and was surprised by the quality of some sites. Others were average -- we noted dead coral on a number of sites (it seemed to be species specific). I would summarize by saying the diving was good but not great. However, if I'm diving in warm water, I tend to be in a happy state!
The quality of the Aquanats operation far surpassed the Wind Dancer. I'd go back to Grenada for a land-based holiday with some diving, but for a liveaboard, I would pick another location and another boat.