A friend of mine, Travis Campbell, did a great review of AuthorityLabs on his marketing strategy blog. This is an example of how someone used AuthorityLabs to make sure their site is positioned where it should be during drastic changes. Travis had to merge two sites into one, and needed to easily ensure he retained his rankings. AuthorityLabs allowed him to get daily feedback on how changes he made to his site affected search engine visibility. He invested heavily in SEO and AuthorityLabs helped him protect that investment.