I bought two VR headsets in the mid range last week, the Project Fly which claims 120 degree field of view and the HOMido which claims 100 degree and doesn't' mist up.
Both are utterly awful with the iPhone. I mean basically unusable. They were both priced over £100 originally. I tried them for about a total of 30 minutes combined with a bunch of the best VR apps and its not something id ever like to repeat. The quality is just diabolical.
I'm sure HTC Vive and Oculus Rift is a million times better, but I have no real idea to experience VR again now - it'd have to be earth shatteringly good and even though i'd only like to experience being in different places, not playing games.