Most of the feedbacks must be positive. When you surf the internet, you will see advertisement that guarantees your website at number one ranking position. No one can guarantee number one ranking position because the algorithm changes every day. If you see such advertisement, you should avoid it so that you won't get cheated. The SEO service should be priced reasonably. It should not be too expensive. It is best if the SEO company only collect payment after they help you to rank your website. In this way, if your site is not ranked on the search engine, you won't have to make payment. The cost of the SEO optimization service ranges from a few hundred dollars to a few thousand dollars. Some SEO companies require to make the payment every month. There are also SEO companies that ask for one time payment. You should select the SEO company that offer the SEO optimization within a budget price.