ultra nano clear is practically the same thing as curved crystal.
the only difference is just that nano clear is cut short around the edges due to the curved screen of the S3,
whereas the curved crystal overcomes that problem by curving the screen protector to fit edge-to-edge on the S3.
both have equally excellent clarity as if nothing is on, both have a slight squeaky feel to it when finger glides across, everything is just good.
but my only complaint is that it's VERY easily dented / scratched.
just give it to a friend who has long fingernails, you will see that the entire surface of the SP is scratched/dented up.
the reason why is because of the surface hardness of only 2H.
nonetheless, the curved crystal did an excellent job as a screen protector as it protected my screen from scratching when my phone dropped in the garden one day and the screen scratched against a flower pot.
The result is massive deep scratches on the screen protector, but not a single speck of dust or scratch on the screen itself

Thanks for that. I can image the feeling that time of drop