With sexiSEO, you can choose from a number of packages to fit your business needs such as Easy Ranker, which is the least expensive, Game Changer, Dominator, and Business, which is the largest package. These all include manual link building and full search engine optimization (SEO) service.
The difference in manual link building is an important part of what they do. Often times people use automatic link building, which Google not only hates but can penalize your site for using them. These types of links are of low quality and only hurt your site, not help it. At sexiSEO you never get automatic links - just high-quality links that help your site rank higher on Google's search engine.
Now they can't guarantee you'll be on the top of the listings from day one because it all depends on factors like your competition, etc. but they can guarantee that you'll rank higher at an affordable price.