Unfortunately, although the DXG is supposed to be better for reading PDF files it has a crappy way of doing so. Maybe we will eventually get a firmware upgrade that will bring us up to the standard of the K3 PDF implementation.
Don't know the answer to your second question - time will tell ;-)
I've never bothered with screen protectors for any of my electronic equipment that gets carted round the countryside, just take a little care and if you are worried get a cover. My DX gets to live with multi meters and other tools when not in use and apart from having a soft bag over it it has no other protection.
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