Had you played the previous iteration (The Ocean Course)? It is not dramatically different, due to the fact that they had to work with the same corridors. A few holes were changed, including pushing the green on the one par 3 near the ocean a bit deeper toward the beach, and flipping an awkward, short, dogleg right followed by a par 3 into a good par 3 followed by a fun, short (drivable for some) par 4. It's fun, above average for courses on the island. A few not so great holes, dictated by surrounding properties and ponds/lagoons, but good for vacation golf with a bit of architectural interest.
I prefer Heron Point (Pete Dye) by a pretty good margin (7-3 in the 10 round test). It's very playable, and has some pretty solid green complexes, and a bit more variety from hole to hole. The bonus there is that it typically gets less play (I guess I am in the minority with my preference), and may even be priced a few bucks below Atlantic Dunes. If you do play Heron Point, keep an eye out on the fifth tee for a big, fat gator. I've seen him lounging on the middle tee box there more than once over the last several years.