The WU-1b wireless mobile adapter was a gift for my birthday, although I did give out some ideas of what I would like. I have not had much time to use it yet but I have given it a little test run and overall I am impressed with it. Pretty much plug play download the app Nikon WMU for Apple or Android link the adapter to the smart device and your away.
You can view / review images on the camera via your smart device and share over your social media accounts. Take photos by using your smart device as a remote, image downloads and saves in your photo library.
The wireless adapter itself is pretty tiny, you get a little plastic case to attached to your camera strap for storage of the unit.