This place _will_ be nice. Will. Since work is still in progress. We visited the hotel in Jan 2012 and they said, work will be completed in March 2012. 50% of the rooms and the grounds were completed by then, so I suppose you should expect a fully working resort in Dec 2012 or Jan 2013 ;-)
Rooms are very nice, but many details are missing. If you are planning to stay longer than 2-3 days this might be an issue.
The location is very secluded and you will be eating most of the time in their rather expensive restaurant.
But it will be the most luxurious resort in Koh Kood!