Almost unusable
Ive used the WU-1a with WMU on a D5200 and a D7100 and its really bad. As often as not you lose the connection or it simply hangs, and transfers are amazingly slow. I cant decide if its the software or the WU-1a hardware but either way I would not have bought this had I known how unreliable it is.
Surely Nikon can fix something so basic.
HardCoreBusUser about
Wireless Mobile Utility, v1.4.2