Just an update. I actually find it a lot easier to read with the glossy surface. Reason is that the bare matte screen tends to make light sources that reflect off the screen turn into big blobs of light, which makes it necessary to turn the reader quite a bit in order to get rid of the big blob of reflection.
With the glossy surface on, I just need to tilt it ever so slightly, and the glare is gone.
Yes, I can see myself in the reader's screen now, but I find it a lot easier to "ignore" reflections than big blobs of light.
FWIW, I find it's a lot better, and the screen protector was cheap too.. 2 bucks, from
Daiso 