Odd wording. I suppose if you had ten menthol brands, one would have to taste best, inasmuch as such a subjective thing can be measured. But it makes it sound as if one brand simply must taste best due to some external circumstances.
Clever guarantee: buy two packs, and if you don't like them, send the wrapper and second pack back. Which no one would ever do. You'd want to keep them around. Just in case.