Nippi,
I have had this on one site for a year and another for a month. Results dropped about 80% as a result. I believe it is a human edited ranking assessment.

Sites are different subjects; not interconnected; each page individually hand written and unique. They have some affiliate/adsense links but not excessively so.

I now see nothing but scraper sites using my content above me in the results for a search for myuniquesitename.