One thing to keep in mind is that any SEO agency should be well-publicized that promise you the “top position for an X keyword” or something similar. Almost all of the modern search engines have used personalized search, which means that everybody is found on a slightly different ranking of websites based on their personal search history.
The full ranking is about the past, anyone who claims to serve such a service speaks ill of its teeth. Modern SEO Agencies will use the “white hat” technology to survive to bring useful traffic to your website, exploit and use Walk, which constantly slap them from search engine updates like Google’s nominated panda and penguin algorithm transformation.
