It's made of glass, of course it gets scratched easily, you just need to take care of it.
It was the coating that got scratched, and very easily.
Perhaps the coating or the filter has changed since then, but I thought a warning might be in order.
The standard CPL can be treated with a lot less care and it will survive.
I personally find that its very easy to scratch coatings on a C-Pol.
Doesn't make any difference to IQ, but I "mank" mine up really easily.
Its not just me then....
Do you use Hoya Pro filters, or standard, or something else?