You really can't go wrong with staying at the D2. We've stayed there numerous times over the years and find it hard to fault. The rooms are nice and always clean on arrival. At the time of our last visit (April 2015), they were conducting major renovations/improvements to sections of the hotel. It's great to see they're constantly spending money to improve facilities for guests, unlike a lot of other hotels in the area that have just been allowed to get run into the ground. The noise from the renovations were always kept to a minimum and I really only heard it a few times. These renovations were due to be completed by the end of May 2015 if you're worried about any potential noise. Saying that, the plans for the renovations looks awesome. Can't wait to see the finished product next year.
If you stay at the hotel make sure you get breakfast included. Without a doubt, the best breakfast of any of the hotels we've stayed at in Thailand. Such a massive selection of food and it's always fresh.
The staff at the D2 are wonderful. They were always so welcoming, from the hotel reception right through to house cleaning. Something other hotels in Thailand could learn from. Of particular note is Golf, one of the duty managers at the hotel. I had a very minor issue that I raised about our room. The matter was dealt with immediately and he went above and beyond my expectations to resolve the very minor issue.
The only thing people should be mindful of, if you're planning on having big nights out in Patong, ensure you get a room away from the pool area (near the pool bar). On our last visit, there were a lot of families staying at the hotel and quite often we'd be woken in the mornings by kids playing in the pool. Oh and they've installed a volley ball net in the pool area. Some constructive criticism for the hotel management, I think you should get rid of the volley ball net. Great for the roof top pool but bad idea for the main pool area. It just creates too much noise that echoes into the rooms. Also rather distracting if you're trying to relax in the sun on a deck chair. Apart from that, job well done.