However, I notice a difference with my other batch, second one I currently own which is 250 ml flacon of 15X21. Both of them are great in longevity, 8-10 hours no problem. Batch 15X21 is little more apple, smokier and slightly leathery. It is amazing as well and those differences are slight, however I prefer first one just a little more and already consider this as a problem. Even if some other people prefer those composition more. Batch numbers is definitely an issue and minus for Aventus at my opinion. Hope that issue will be resolved once and for all with upcoming 2016 series of fragrance.