I use the WU-1A with my D7100 fairly often - In my opinion, the WU-1A wouldn't be good value at all without DSLR Dashboard, luckily I used the app via USB cable before getting the wireless adapter.
I use the adapter in the garden to photograph birds on the feeder - It allows me to retreat back behind the bins and hide while still seeing what is going on.... Also with DSLRDashboard you can change your focus point etc. In a similar way, its good for self-portraits as you don't have to use the timer or be restricted by a cable remote.
On the downside, the WU-1A doesn't have much range.... It can be defeated by things like a window, although this could be as much my phone as the device it's self.
I use the adapter in the garden to photograph birds on the feeder - It allows me to retreat back behind the bins and hide while still seeing what is going on.... Also with DSLRDashboard you can change your focus point etc. In a similar way, its good for self-portraits as you don't have to use the timer or be restricted by a cable remote.
On the downside, the WU-1A doesn't have much range.... It can be defeated by things like a window, although this could be as much my phone as the device it's self.