Today I received the protective screen I ordered from the USA.
It is quite thick and very simple to apply, and the Cintiq lightness and sensitivity didn't decrease as much as I expected. Actually, they are almost the same as without screen, it's just matter to get used to it. Maybe the only note is that the pen doesn't flow as smoothly as it was before.
Anyway, after a month of use my tablet was already showing light signs of scratching, so I suppose it would be a disaster after 2-3 years of everyday work without any protection. I think I can recommend it!
Here is where I found it:
price $18,50 plus shipping.
This doodle is made after applying the screen.
See you next time!