ANTVR comes with two big square lenses that claims to have 100 degrees FOV. It has pupil distance adjuster, foldable design, support 4.5 - 6 inch phones and work with glasses.
I have tried some of Google Cardboard VR gears available and in terms of Field Of View (FOV) this ANTVR Gear has the most immersiveness compares to others even with Samsung Gear VR and Oculus DK2. For me FOV is the most important aspect for immersiveness.
To get more FOV I have modded the soft cushion. I cutoff the thickness by half to get my eyes closer to the lenses. And is working, the FOV improves even more.
The image was very clear, and image distortion was minimal.
One thing I don't like is the open holes gap, so it has some opening holes beside our eyes that ruin the experience. I'm thinking to block those holes with some black cushion materials.
For now, to get full experience, try ANTVR on a dark room and use 6 inch phones.