Scubabear,
DocV is right on! HC has a great house reef (with frogfish, sea horses, green moray eels, squid, octopus...and much more!). I was there this past Dec/Jan. The dive op and DMs are fantastic. But like Doc said, the food isn't that great. I'd give it 2.5 out of 5 stars (but they have a great Chicken Sate). Definately rent a car if possible to try out the local cuisine and visit Willemsted (40 minute drive).
The only downside about Habitat is their boats maintenance. When I was there, the place wasn't very crowded so having only one of two boats operational was sufficient. The boat only went out for AM dives. However, by the end of my stay, even that one boat began to have engine problems. I understand this has been a recurring problem for at least a year now. Hopefully, it has been taken care of.