For adapter can be said that it is extremely small and unobtrusive. At my D7100 adapter is hardly noticeable. The wireless signal of adapter is stable and has sufficient scope. Practically I think especially the small transport box, which can be directly fastened to the shoulder strap and ensure that you do not lose the tiny cube and it has always there.
Now for WMU app:
The first thing that stands out extremely negative and really is already a no-go, is the lack of iPad support. Although you can install the iPhone app on the iPad, but in this case the resolution is catastrophically bad, and the app is not full screen but gecropped. It would certainly be a minimal cost for the app to the iPad Nikon adapt, which would however already draw increases operating comfort for themselves. Then you will still be allowed to wait forever.
The next, really inexcusable, missing feature is the ability to transfer the images to the external device. Granted, you can transfer images from the camera to an external device, but in no event in full resolution. Even if one chooses to transfer the highest quality images, the files are compressed heavily. Thus, for. Example, a photo that is really big 12,7MB at once on the tablet, only 3.1MB in size. This means that the app is really just to transmit preview pictures. Add to that the restriction that you can display on the screen of the camera any images as long as the adapter is turned on.
Android users have at least avoid the possibility of third-party app's. But when iOS users to stay chained to the WMU app for better or worse.
2 Star I forgive just because, despite the crop display, the Live View on the iPad is still better than on the camera screen. The iPad is like in this mode from the lack of folding display the D7100 and is superior to any non-removable screen. So if more emphasis on the Live View function and already operates on the small iPhone screen can maybe arrange with the app. But who wants to transmit data and not use it on the iPhone display would stare the upscaled iPhone screen on the iPad is to stay away from the WU-1a - there are alternatives which are indeed cumbersome and / or expensive, with whom one but himself can free themselves from the shackles of WMU App.
But Android users should not be discouraged by this recession by purchasing the WU-1a. For you there are wonderful alternatives to the WU should work great. Appreciates you happy!