In terms of silage and longevity, everyone is different with different skin chemistry and what-not, there hasn't been enough reviews on here yet of the 15x21, and even if 5 people said it was the best ever, it might not work for you, sorry but thats just how it works. I have 5 batches from 2015 and i like them all, but couldnt give you feedback on projection and longevity because i can wear them 5 days and get 5 different results but they all smell good. That being said im really liking 15x01 and 15u01 because there alittle darker then my first 3, but i wouldn't say smoke...lol just a little darker vibe and i like that