Damn, I wish I had read reviews like these before I dropped closed to thirty bucks on this crap. The protector needs to "cure" but already I can see a couple small (1cm and 2cm) straight vertical lines that at first looked like cracks (I had to throw away that pair of underwear). "Fortunately" I read the recent posts to this thread and found out it's not a problem with the screen. I thought perhaps all the squeegeeing messed it up.
The positive: it protects the screen from accidental scratches and acts like a oleophobic coating that should resist oily fingerprints (I don't know about you but I need that, bad).
The negative: the screen is no longer smooth to the touch so gestures are a little buffered but more consistent (without the shield, it would be best when the screen was clean but it would get jerky when the oil built up); the crisp picture is a little dull.
I don't think the hassle is worth it but I bet when you get that first scratch you'll wish you had the shield on. The grass is always greener on the other side.
Last but not least, at $30 for a piece of plastic, Zagg really needs to deliver perfection. This is just shameful.