I was using the Zeiss VR One with an iPhone 6, until I changed phones to a 6+. I really liked the wide FOV of the VR One. It was a decent low cost solution, but doesn't work with the 6+.
Tried the Findbest goggles, but hated the FOV and returned them. I now have Freefly VR goggles, and like the clarity and FOV. They work ok with the 6+, but its a little tight. With the iPhone6+ you will have to tweak the image size of the VR app.
http://www.amazon.com/gp/product/B0127GIPPG?psc=1&redirect=true&ref_=oh_aui_detailpage_o01_s00
None of the VR goggles work with DJI GO. I have used Cloudlight FPV (a few flights), and also FPV Camera (no flights yet). Hoping Litchi will have its FPV mode on iOS soon, as it has on Android.
My Zeiss VR One's will be up on Amazon soon (the only used pair available the last time I checked).