Yeah, I used the shipping screen protector for the first few weeks I had my N800. It was ok, but it scratched and scuffed very, very quickly.

I bought some typical, generic, impossible-to-work-with, trim-to-size-yourself, yeah-right-this-will-only-end-in-tears, store-stock screen protectors to replace it with, and then promptly gave up on actually getting one onto the N800.

I've used it since with no screen protection, and it's no worse for the wear. No scratches, dings, dents, scrapes, nada, nothing. It's a tough little bugger.