This is a really good question. Most people think that absolutely all the SEO companies do the same work so it does not really matter which one is hired. This is completely incorrect. In fact, most SEO firms are going to fail in the first months of existence. That is normally because of the fact that the SEO industry is constantly changing and adapting. Staying up-to-date with changes and modern practices is not as easy as it may think. When you initially signed a contract with the SEO company you were promised really high quality work. However, as time passes this quality may actually go…

Source: TG Daily – Does Your SEO Company Offer The Promised Quality?