invisible shield
I have had the shield on my last two phones, the Rogue and the Incredible. My wife also got one on her Rogue. We haven't had a single problem. In fact, the reason why I panicked and got it was because my Rogue was getting all scratched up. The shield actually made it look about 75% better following application.
My phone is always bouncing around my pocket with keys and change, and it still looks good a few weeks after applying the shield (I got the Incredible and applied the shield on July 6).
Another thing I noticed is that I can see my screen fine in daylight. I have no idea if that is due to the shield, or if I didn't get a phone that was Amoled. Considering I had to wait a month for my phone to arrive, is it possible that I didn't get the screen that the originals got? It isn't PERFECT in sunlight, but I can see it fine. I thought that, perhaps, the invisible shield was helping in that regard.
Lastly, perhaps the problems that people had came as a result of applying it themselves. In both cases, I had a guy at the mall apply it. They sell and apply them at a little cart. It was expensive, but I felt worth it.