It is nice when you find a tool that works tremendously well for a particular purpose.
Shaved ice is something that is nice in the summer (think snow cones) and essential for the queasy stomachs of sick people. I don't know how many inefficient ways we tried making shaved or crushed ice in the past, like pounding on ziplock bags of ice with a rolling pin. Most ice shavers you buy require large frozen chunks of ice that are hard to make and take a long time to freeze. They work well, but you need that frozen chunk first.
A few years ago I found an Ice Grating Disc for our KitchenAid Food Processor that works wonders making piles of snow-like shaved ice from plain old ice cubes--just what's needed for a sick family or on a hot summer day. (Can you picture one of those hot summer days in your mind? I know you can.) I highly recommend this disc if you already have a KitchenAid Food Processor.