After reading this thread, I really have to offer a cautionary tale about screen protectors.
After a while of heavy Mario 64 DS play, I noticed that I had 2 or 3 light hairline scratches that were probably only "glare scratches" to use someone elses terminology--they weren't visible at all unless I looked sideways across the unit. However, just to be safe, I bought Pelican screen protectors and put them on.
Ever since I put them on, the touch screen has gotten less and less responsive and accurate. I played through much of Chokkan Hitofude (Polarium in JPN) and the more I played, the less playable it became because sometimes my lines would end early or not track correctly. Anyone who has played this game to the upper difficulty levels (700 lines+) knows that one mistake can and will cost you the game.
The scary thing too is that the Pelican protectors came with no directions--it came with a "soft card" tool that I assume is supposed to be for getting the protector off, but trying to take it off carefully has yielded no results whatsoever.
Does anybody else have Pelican protectors? Anyone else had these problems? Any input would be much appreciated--luckily I got an ESA from EB and my friend works there and says he might be able to swap it out for a new one for me, but before I resort to that I'd like to take the protector off...