In this video Chris gives you his reasons behind buying crash pants (or impact shorts) and his experiences with them so far. They are great protection for snowboarding, especially for people with hip or back injuries.
They can be used by snowboarders of any level because we all fall, and they will not only minimise your risk of injury can give you more confidence while riding. Beginners will probably get the most use, and they definitely turn bad falls into bounce back and keep riding. They also insulate your body while seated on the ice / snow or even the chair lift on a cold day.