Works very well, genuine 3D – Cardboard Camera Review

I was expecting the "dome"-style photo result often produced by 360 content that doesn't have depth - but on the contrary, stereoscopic depth is indeed recorded in your images and looks excellent on the result. The only significant limitation is a narrower vertical view than one might desire, but it is minimized by choosing your photo locations with that restriction in mind.
Review by jphilanth on Cardboard Camera.