So I recently bought one of those google cardboard based plastic HMD with straps and everything. The fov is alright, it doesn't spherical lenses so I can use Tridef3D and streama 3d side by side image using Moonlight gamestreaming on android. I got a 2way970GTX SLI in my PC and I am able to stream games at 1080P 60fps to my phone.
So far it's been an awesome experience to test VR in it's developing stages. I tried Bioshock on it, it seems to be the best one to try. The big problem that I had was the aspect ratio, it seems to be 5:4 and not many games support it, so I end up using 4:3 which stretches it a bit.
The worst part was setting up headtracking using my phone, I found an app that transmits the gyro data to pc via wifi using FaceTrackNoIR. It's not perfect but it does the job emulating the mouse.
I had a great time playing around with it, my phone is a Sony Xperia z2 which has a 1080p screen so the games looked pretty clean.
I wish they made one that puts two phones side by side to get a greater FOV.
Anyway here is a link to the HMD I got.
http://www.ebay.com.au/itm/361303220227?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
What are your experiences with Google Cardboard based HMD?