Liquid Crystal Filter Portable
I really don't know what's so terrible about this product.

I chose this protector over the Taku Screenguard (that I had bought when the original PSP came out) because I absolutely love Hori's Nintendo DS Lite screen protectors (I stock up on them and change them out every few months or so).

This protector leaves a 1mm gap on each side if applied to the center of the PSP screen, which really isn't a big deal (for me, anyway).

Also, these are extremely easy to apply and remove. Scotch tape works miracles with it (as with the DS protectors).

I got air bubbles when I first applied it, but because I don't have to worry about damaging my PSP when removing the protector I'm just going to wait until the time comes for me to replace it with a new one. It isn't like the bubbles interfere with gameplay, they're just annoying to look at when the screen is blank.

Not that Bad
It's Really a nice product.
It is totally invisible when it's on, except there's some tiny bubbles at the edge due to the design of PSP Slim & lite Screen.

Overall I would give it 4.5 actually out of 5

Horrible
This thing from HORI sucks bad. I was skeptical about getting this thing after reading all the bad reviews but I decided to give it a try myself. Even after applying it on properly, the thing gives me a bunch of air bubbles! Come on HORI what were you thinking when making this product. The first one I bought a couple of years ago was much better and I had no problems putting it on my original PSP. This one gave me more problems than I thought.

I am not happy at all with this purchase. The only reason why I bought this was because there are no other good screen protectors available on P-A. I'm not sure if the other one from HORI is better but they have been on "back order" for sometime now. I will get that one instead when they are available and hopefully that one will be much better.

DO NOT BUY THIS! YOU HAVE BEEN WARNED!

What's everyone complaining about?
I don't know what everyone's complaining about. Excellent screen protector as always from Hori. Yes it does not fit the PSP screen PERFECTLY but that's expected. The DS Lite Hori screen protectors are the same.

Providing you attach the screen protector evenly it will leave a 1mm gap on each side. Someone said it leaves 3mm on each side...that isnot true. Don't attach it starting from the very edge on 1 side otherwise you'll get a 2mm gap on the other side. It really doesn't bother me though. You're not going to be able to scratch the gaps anyway.

I think the gaps are there so that you can take it off easily and replace it if you have to. If there was no gap it'd be hell trying to take it off.

The image looks EXACTLY the same as when there is no screen protector attached. Grainy effect as someone said? What the hell? Maybe someone got a dud or didn't put it on properly? You can't even tell it's on.

I seriously don't know what everyone's complaining about. It only leaves a 1mm gap on each side providing you attach it evenly and properly. This is the best screen protector for the PSP anyway. Ignore th others.

Not really great...
after all the reviews I heard... wow...