It isn't good sometimes. When we get a product frm the market after seeing the poster, it may not be the same as it is in the poster. Take for example some shampoo, it says use this product and u won't hv hairfall. After using the product two times, there is excess hairfall. Which means the shampoo does not suit u. But for some ppl, they use the same shampoo and they hv less hairfall. This is my point of view.