I upgraded from the Nikon D5000 to Nikon D600 and although DX lenses do work on the D600 I wanted to take advantage of the full frame sensor so decided to sell my old DX lenses. However, I didn't have the cash to buy the Nikon 24-300mm to replace my Nikon 18-200 DX lens right off the bat, so decided to get the Nikon 24-28mm lens that comes as the D600 kit lens.
I have been using this lens for a couple of weeks now and am really enjoying it. It doesn't totally replace my 18-200mm but since most of my shots are landscape and travel shots it does the job for 90% of what I want to shoot. So far the quality I am seeing from this lens is impressive and am looking forward to using it more.