The crystal is not glaring at all. I highly recommend it, and used it twice. I'm not sure why people bother putting anti-glare films on it etc. it just takes away from the beauty of that bright gorgeous screen. We spend all this money on a nice screen, we should enjoy it. Of course protect it as well, but with a reasonable compromise. The crystal film complements the iphone's screen very well.
Unfortunately, it does collect smudges but it's not so bad, and better to have smudges there than on the main iPhone's screen.
I do wish it was cut more precise as well.