Abstract: The article considers the issues of legislation observance in the sphere of advertisement compliance with the requirement of credibility of information about the advantages of the advertised goods over other goods. The analysis of judicial practice shows that this issue is rather controversial and is solved by courts in different ways. Thus the article also deals with the issue of the criteria of advertisement if the advertised product is endowed with such categories as “the best”, “the first”, “number one”, etc. The consideration of the mentioned problems is especially important for law-enforcement practice of commercial subjects promoting their goods and services. The author outlines the criteria which are positively and negatively taken in judicial practice of Russian courts considering the cases of use of the superlative degree in advertisement, their analysis and consideration of specific examples from the recent judicial practice.