I had a power support anti glare before that was a good screen protector but due to the texture surface it changed the display quality into a sparkly mess!

Well this on is fantastic you can hardly see it once its on right! its just as shiny and fingerprint resistant as the olephobic coating on the 3GS itself!

The one thing I think the power support one has up on this is the pre-installation sticker you get for the screen that you apply to the 3gs beforhand then peel off to remove very fine dust then apply your protector that would of made it easyer then trying to fish out odd bits of dust with celotape!

Otherwise this is one of the best protectors ive used for the iphone and a great price! if they do a film for the backside of the iphone ill be straight back!