I went over Christmas and loved it. Koh samui is amazing and there is so much to do with the kids. The villa (brand new it seems) has all the mod cons and then some. The maid cooks up an amazing lunch or dinner and you really dont need to eat out. Very kid friendly (I have 3 young children) we visited Le Beach Bar most days which is 2 mins down the road. Lots of water sports etc. The villa provides you with a car and driver so it couldn't be easier. The Four Seasons is also on your doorstep if you want to indulge.
Best location and best villa I have ever experienced in Asia.