Fourth comes a customer forum. If a vendor has an effective product to sell, he won't mind customers discussing their experiences online. Customer forums are a great way of getting in touch directly with men who have already tried various products and can give you a first hand account. This goes hand in hand with the information featured on the website. The more information about the product (not just beating around a distant bush), the better. If the vendor is not shy to talk about the product then he probably has nothing to hide.