I have a Z30 and had Wifi issues with the 10.3.1.x leaks. Poor Wifi signal and frequent disconnects. Got tired and went back to the official 10.2.1 day before yesterday. I also had problems with remote file access wherein it was painfully slow to show up my folders.
I'm on a wait and watch and not in a hurry to move to 10.3.1. I'll miss the touch anywhere to click feature of the camera.