I scratched mine in less than 24 hours after I bought it. They were 2 fine micro scratches that happened when I tried wiping the screen with the included cloth (with dust particles I din't know existed between the cloth and the psp screen ---> my own logic of what might have happened). Well, so I bought the HORI screen protector and applied it.
Tips: TO apply the protcetor, make sure you wash your hand really good, and dry em REALLY GOOD. OR try donning latex gloves to apply the screen protector, as you don't want any finger prints / smudges to appear UNDER the protector. Take the protector with one hand, and take a soft ruler/ card/ 10 plies of post-it notes on the other hand (I used the METro card that I gpt when I went to NYC---- this thing will help you applying the protector and to avoid air bubbles to get entrapped under the protector.