Let me start off my saying I have a vacation house in Maine that has no running water or electricity. Let's just say, when I go, I am everyone's best friend. I purchased this brand, because the cheaper brands just didn't work or made your hair almost look grey! This dry shampoo is the best out there in my opinion. A little bit goes a long way and I will buy a bottle about every year and a half. I have also found this handy to keep with me during the summer. Sometimes the heat makes my hair look greasy or if I am caught in a quick downpour, using Rockaholic dry shampoo makes my hair look fresh and not weight down. This product is easy to over use. Like I said before a little does go a long way and if you do over spray, your hair won't look greasy, but will look like you just dunked your head in baby powder. One application can leave my hair looking nice and fresh for two days when I am in Maine, so it does last a while, and my hair is thick!