So I just got the ZAGG InvisibleShield for my i9300 for 29,95€, and I must say it was one of the most wasteful 30€ of my life. The cut is horrid, not covering large parts of the screen. Also why would they cut a hole for the led light? 
My recommendation: STAY AWAY(at least until they fix it, which I doubt they will).
Getting a Copter one tomorrow as a replacement.
My recommendation: STAY AWAY(at least until they fix it, which I doubt they will).
Getting a Copter one tomorrow as a replacement.