Has any one used a deodorant stone before. I never knew such a thing existed. would you reccomend using it. and please tell me what it is exactly, and how does it work and how will it help me from a normal deodorant. is it rewadily available in a place like Derbyshire, England as that it where I am from. Please revert back and let me know, so i could buy and it gift it to a friend if it is any good.