+1 i just put one on my macbook pro a couple days ago, it makes everything a little pixely, kind of like when u get water on it u see what's kind of like noise. Really hard to describe, in the darker areas its fine.
It's good for some reasons though, and I've kinda gotten use to the screen weirdness. Its really easy to wipe clean with ur hand because no fingerprints! and it's better for when your in a sunny-ish environment
Anyways the ebay seller i got it from has a website called gagacase.com and if you use the code
RETURN10 you get 10% off. I emailed him that there was a crease/crack in mine probably due to shipping, and he sent me a new one that's on its way
so i might as well give them a plug for being so nice :P