I was out shopping yesterday, and bought a screen shield. It's the same as the one I bought before, but this time I watched the YouTube vid on how to apply it. Looking at it now, you wouldn't know it had a skin on. Makes no difference to the clarity on the screen and I'm touch typing this fine.
I had to do it, although I didn't want to... I have two kids who use the iPad, and whilst my daughter is fine, my son... Well every time I kicked it up it was sticky! I don't even know how he does that... I make him wash his hands before using it every time. Anyway, as I kept getting stressed, I bought the shield, and am much more relaxed about the screen now! It also doesn't get the irritating lines from the smart cover, which I had to wipe off before every use.
The one I have is EasiSkins micromend... It is very good.