Thanks, Mokel! This will be very helpful, I imagine.
If I had it to do again (I know I could take them off, but I won't) I would look for a matte finish or glare-reducing protector, maybe one of the Clarivue or iPad ones, instead of the XOskins.
My overhead lighting is bouncing off the shiny XOs. I will just live with the glare, though, because they are thick and scratch-proof. Just have to be careful how I angle my EE for reading.