Just installed one of these on my phone last night. Gotta say, the front/touch screen portion was, by far, the hardest to apply. The rest (three other pieces) went off, pretty much, without a hitch. Problem (for me anyways) was the corner flaps. Took forever to get it lined up to the point where there weren't bubbles or rough corners.
Hopefully, over the next day or so, things will start to even out. 24hrs later and things are already beginning to appear to be working themselves out. But, as the site says, I'm hoping that after a couple more days everything will be smooth as silk.

So far it seems that it will be a better choice than the plastic case (which arrived cracked)/screen protector that I had before.