At less than a dollar per sheet, you can afford to treat them as disposable and not be too upset if they fall off or lose their ability to stay on that long. What sells the screen protectors for me is that they come with a grid on the backing so you can easily measure and quickly cut to match the size of the LCD you're protecting. If you want something more permanent, then go with Invisible Shield or Best Skins Ever. But for the price and their versatility, they're well worth it.