It doesn't protect against scratches either, at all.
On the contrary in my experience.

I have my n900 for almost 2 years, all it's got is a bunch of superficial scratches that are not really noticable when using it.
It's seen the floor multiple times.

Had my n9 for 1 week when i noticed 2 deep small scratches that alternatingly reflect pink/light blue light when screen is light coloured.
So often very noticable when using it.
And that was while being very careful with my new device, i actually paid attention not to touch it with anything hard so where the f*** do these scratches come from?



Glass screens feel good to the touch, but that is about all good that can be said of them.
They scratch, they crack, are not covered by warranty most of the time and they are only good for imprecise input methods.

Why do all manufacturers insist on using them? aaaarg!