I had a bowl during installation since I have no bubbles or dust appears on the screen, but unfortunately I have two three small bubbles around the glass that does not bother me absolutely.
We will see its evolution in time, but if it does not come off at the edges nor crumbles to, I think it will get the title of ultimate protection :)
FYI, I (stupidly) tried to scratch the cutter to blow glass by "typing" with the point, not just by cutting, and the window perfectly resisted my attacks :)
So, darling just received the iPhone version 4, I asked him last night, and I have a colleague or two who, after me was mad typing its iPhone with a new cutter, have hallucinated the results and say about to order one ^^