I followed these instructions but instead of the Technical Preview I installed 5.6 beta. I have Pixel XL and so connected my Daydream controller instead of a phone with emulator.
When I get into the Editor and load up the demo scene, and run it, I get this message:
To use the controller, please upgrade to a version of Unity with the GVR native integration
I am not entirely sure what this means, I've searched around a bit and on these forums, and have found no joy.