It's practically imperceptable. I noticed the glue a bit at first but was able to easily peel away the excess glue. I haven't needed to remove the screen protector yet so I can't answer how easy it is to remove. In case you're considering using a case, I had the Ringke Slim case and while it fits over the screen protector, I could no longer turn crown dial. The Spigen Liquid Air case still fits with the screen protector on.

If you're interested in a case like that, Spigen has one.