I love that it adds no bulk or weight to my phone and is invisible, without those horrible peeling corners that you get with other types of screen protection.
It takes just a few simple steps to apply and, apart from overnight curing time, is really quick to apply.
I know that it isn't possible to prove the scratch resistance without attacking your phone! However, during my four years of very clumsy handling of my phones etc, I haven't sustained any scratches to any of my possessions that have been treated with Crystalusion.
Crystalusion is also great value for money, especially when bought as a twin pack.
I use no other protection on the screens of my phones and would highly recommend this product without any hesitation.