This what I have been looking for, for a long time. It fits very well around the PSP, while leaving shoulder buttons, charger port, and headphone port exposed for use. It will hold 2 UMDS along with your PSP SLIM (2000), but has a foldable screen protector that comes down and locks the PSP in, so despite the extra room (used or not) doesnt cause the PSP to flop around inside like the Logitech slim case. When you open the lid the screen protector still stays locked in so your PSP doesnt flip out. I hate flopping out, its the worst.
Only real cons are, even though you can play the PSP inside it, it makes it quite bulkier, but I loved this since the thing was so small it makes my 4th and 5th fingers go numb, now no more. Also, the screen protector, that stops it from flopping around and damaging the screen... well its slighty crooked, to the right, may just be mine, and I am extremely picky, so it may not even bother you. Also since the case, for your convience, leaves a few ports and jacks open it lets in dirt and dust, so I wrap it in a cloth and then take it with me in my bag, but again I am extremely picky, so it may not even bother you. Also the lid, unlike the Logitech one is 2 hinged and loose, so hit hangs down on your knuckles if you play it while in the case, but for me the slight lose in convience is well worth the gigantic increase in protection.
A bit long, but I really wanted to get it out there since i bought, tried, and returned many cases because they were pure garbage.
Hope this helps!