If you've used your PSP for any length of time, you know how dangerous it is to have that screen anywhere it can be scratched. The face armor helps to keep it shielded.
Yes, there are things you can slide your PSP in when you're done using it, but I have to be honest, I rarely do that. Then I toss the PSP into a backpack or other bag, and it risks getting scratched up.
Since the Pelican face armor actually attaches TO the PSP, it's very easy. I screwed mine in without any problem at all. You flip it up and use the game system. When you're done, you just flip the shield down and it's well protected. There's even a middle setting you can open the armor to, to keep a glare off the screen.
I'm not sure there's really any down side to using this. It doesn't interfere with your button pressing. It's very light. It's removeable if you really want to take it off for some reason.
In addition, the Pelican set comes with 4 disc jackets. The PSP discs have an open window on them that you want to keep free of dirt and dust. Carrying them around in their original box takes up a lot of space. With the disc jackets, they're easy to toss in a pocket without worrying about them being damaged.
Well recommended if you have a PSP!
Buy Face Armor from Amazon.com