I'm a bit of a VR fanatic with over $650 dollars spent on VR gadgets.
i have one. better than the OcR imo. I own both and the Oculus grows old pretty fast. The cardboard does too but it is super easy to carry around and show other people, which is the fun part.
Pros:
Extremely high resolution, much better than the Oculus. (cause it uses your phone screen)
Can move or spin around without cords bundling you up. (main problem in the Oculus)
Can easily show other people or inconspicuously fit into a bag. (can't really carry an oculus around)
Cons:
Very fragile. One of the lenses pops out a lot on mine.
There is a little slit beneath your nose where all the light floods in and it is annoying, but not too bad.
They make the assembly look easy. Mine even said "Assembles in under 10 minutes". Take 0.5-2 hours to assemble, depending on skill.
Got mine for under $10. Definitely worth it.