I was a little concerned that it didn't cover enough, but after writing a bit with the Spen and swiping out some emails with Swiftkey - I didn't run in to (or over) the edge of the protector once. I also stuck mine down a little left of center. Not by much though. Make sure you line it up right since there isn't much room to screw up or you cover the front facing camera.
I will also say .. anyone buying a screen protector to add some "grip" to the screen so it feels more like writing on paper, this isn't the one for you. The Spen and your finger slide over this thing like they're on ice.