Also, the difference between cell-phone VR and something with full positional tracking is huge. I can't really deal with Daydream/GearVR for more than 30 minut

Also, the difference between cell-phone VR and something with full positional tracking is huge. I can't really deal with Daydream/GearVR for more than 30 minutes but I can use even my Rift dev unit for hours. I'd imagine the retail Rift or the Vive would be even nicer but I've not used either for extended periods.