This question is in another discussion here as well. From what I've read, ALL e-ink screens come with a "screen film" vs an aftermarket "screen protector". This can be clearly seen on the Tab Ultra (which I have). The big question, to your point, is whether the Tab C (which I have on order) has the factory screen film since it's the Kaleido screen.
I tried the Doodroo and I'm definitely not a fan of that. I ordered the
Healing Shield Screen Protector to give that a try.