I bought a Glo when they first came out and I have not had any issues with the screen. I carry it around almost every day but I do keep it in a cover. However, when reading I normally take it out of the cover simply because it's lighter.
Most of the concern as far as I can tell came from an article where somebody dropped their TV remote on the cover and somebody else (in order to test it) dropped their keys on the cover. I have been reading with e-books ever since the first Kindle came out and I have yet to drop keys, remotes or any other household items on a screen Glo or otherwise.