We have wanted to stay at the JW Marriott for some time and took the opportunity on our last trip to Atlanta. The main advantage is the very convenient location to various Buckhead activities (restaurants, shopping). The rooms are quite small for the price and the bathrooms are very small. The furnishings are no better than normal Marriott and Hilton rooms.
There is a small restaurant which has a buffet breakfast, which at $50 for two is quite expensive. Self parking in the adjacent lot is $20. They have a lot of staff around if you need something. They offer shuttle service within a 2 mile radius of the hotel.
It was OK for the weekend. I would not want to stay much longer. In the area is a regular Marriott which offers the same convenient location.