There are claims by many people that Yoodara dolls do really work. However, this depends with the beliefs of a person on issues related to casting spells and divination. Find out more from http://www.yoodara.com/members/seriousstuff.
I think it's okay to have a little faith in a guardian angel or good luck charm. Maybe it's not 100%, and some may think it's silly, but I like the idea that positive energy and thoughts can result in positive direction. If you need a little help with something in life and that charm helps remind you to stay focused on that direction then I think it proves that they work!