My wife and I recently stayed here. The resort offers diving, fishing, and adventure packages. We did the diving package. The diving was fantastic. We are fairly new to diving (2 years) and have been diving in Maui (2 trips) and the Mayan Riveria. This was easily the best diving we've done. We had good luck during the week - 8 carribean reef tip sharks, 8 dolphins, several spotted eagle rays, nurse sharks, taurpin, black grouper, and many other great encounters. The dive staff is top notch. We did 3 dives every day, including a day trip to the blue hole.
The resort itself is also very nice. We stayed in a beach front cabana. The room was large (king and long single) and clean with air conditioning. The staff is very attentive and the food is very good.
One of the days had little wind and there were some bugs - I suggest bringing some bug repelent. As long as there was a breeze the bugs were not much of an issue.
The resort is very secluded - there is nothing else around. The only people you will see are the other guests and the staff. The only time we saw any other dive boats was on our trip to the blue hole. The maximum capacity is 24 guests - there were about 20 during the week we were there.
You can do full or partial weeks. It's about a 2 hour boat trip to get out to the resort. I recommend doing a full week, which is what everyone did, the week we were there.
I highly recommend this resort. Everything about our stay there exceeded our expectations. The reviews from the non-divers that were there the same week was also unanimously positive.