I also got myself the Invisible Shield. Actually need to spray maximum on the shield itself (not the phone) to make it easier to install. I had one issue where a bit of dirt got caught, took me a heck of a time to remove the dirt before I could re-apply the skin.

I find that the skin itself stretches abit too much and causes the alignment to go wrong easily if you're not careful when installing it. As for the corners, I just pushed them down every 10 minutes and eventually they stuck. The skin helps with less fingerprints on the phone but is prone to collecting dust particles on the sides. Even aligning the front piece with the border doesn't make the home button opening fit perfectly (mine is a little opened at the bottom of the button).

The skin has bumped-like texture all around and isn't smooth. So it takes the shine out of the phone's original surface especially on the back.

But I'm fairly happy with it because it has more grip and does a good job of protecting against accidental scratches.