I love the utility of the iPhone 3GS, but am often scared the shiny screen won’t last. I decided to try out a state of the art screen protector to protect my state of the art device. The ZAGG invisibleSHIELD is a highly marketed screen protector for the iPhone and other similar gadgets. In the over-supplied world of iPhone accessories – and particularly screen protectors – the ZAGG invisibleSHIELD tries to distinguish itself by claiming to be the “gold standard” of screen protectors. The dilemma I decided to tackle was to find out if the high price ($24.95 retail) was worth it.