I've used a couple of their protectors over the years. It's a clear protective shield to protect against scratches on portable devices. Initially they focused on screen protection but have moved to whole skins as options now. They offer lifetime replacement guarantee. Initially the product was developed as a protectant film for military helicopter blades and they have moved into this civilian application for the product as well. I've had one of their shields on my Dell Axim X51v for a few years and it has held up excellently. While clear the film does increase glare a bit. Now and then I think I pick up some slight distortion but the light has to be just right (or wrong) to notice. Installation is not difficult but has some subtleties to it. Wash your hands, clean the device, wet your fingers and the device with the provided sponge and fluid. Peel off the shield and wet the adhesive side. Apply to your device. The wet fluid and low initial adhesive gives you some play and wiggle to get the application centered just right. This is where the subtleties develop. While the shield doesn't have much grab at first, it quickly develops.As you start to squeegee down the shield with the provided discount card (towards future purchases) slipping can develop. You can peel it back up and wet it again and still get good stick, but you may start to impart fingerprints in the adhesive so better to be generous with the fluid and orientation before applying pressure for adhesion. You also don't want to get any liquid in your device so you can't go too heavy with the fluid. You'll work out air bubbles over the next few minutes. Some will develop slowly even after you think you're done but they can be squeezed out in my experience, even the next day. Full adhesion develops over 12-24 hours but you can use it fairly quickly in my experience. I've got a cheapo phone so I cut a screen fit out of the cheapest shield I could find of the right size at Best Buy. I won't get the guarantee on that one but I will get the protection. I've got one coming for my Cowon. I think the Invisible Shield is a critical component for longevity of any touch screen device. It also makes them pocketable so they don't get ruined in pocket. Good no bulk added protection for many devices. See more at www.zagg.com Good stuff.