I bought this sample size at a droguerie in Germany. I believe you can only buy these products in Germany, maybe also in Austria and Switzerland. Udo Walz is a famous Hairdresser in Germany. This product is aimed to give blond hair a golden shine. In general as a shampoo is nice, but if we focus on the gold shine part I can not say that it was very effective. Maybe if you use the whole range dedicated to blond hair it gets a more obvious effect. Although I know that the Manzanilla Grisi shampoo works even without using the conditioner together with it.
Would I buy it based on this sample? No.