It held up really, really well. The Slickwraps served no use whatsoever and scratched from day one. No problems with the Nillkin at all.
I'm sure it still holding up too, for the @rseh0le that stole my phone a few weeks ago
It's just a shame the M8 camera doesn't suit my expectations. I'm back on an old Note 2 waiting for the M9. The Note never needed a lens protector.