Google cardboard is one of the best vr headsets .
Basically vr is nothing but virtual reality which a smartphone runs a vr app using its gyrpscopic sensors for head tracking .
Besides it pains a lot near the nose and eyes for the first time but you will get adjusted to it .
Some larger smartphones do not fit in it .
It is a bit too heavy when inserted , and it hangs in front of the nose .
It is not durable but is surely reliable.
Good in its price bar .