I do not and never will have a Jolla C but I have a Jolla A with the cheapest screen protector I could find. Something like £1.49 for a pack of 6 delivered. The reason I mention it here is that the plastic film also felt unnatural on the first use compared to the naked glass. There was a noticeable resistance to dragging your finger over it. But it somehow smoothed out after a few months and now I can no longer feel the difference. Perhaps it might be worth waiting to see how the pre-installed Jolla C protector feels after some use before rushing in and investing in some posh solution. That's what I would do but then, I am a cheapsake.