I'm not going to take a knife to my PSP screen, but already the front of my PSP is dirty as hell and I've only played for about t totaly of 4 hours.. I just know once the PSP leaves my house and I start lugging it around on the train etc, the chances to apply a massive scratch are going to increase exponentially.
The UMD thing also sorta concerns me, since my method of transporting portable games it just to toss them into my jeans pocket and go...
:-(