Avenue Montaigne is a sweet, heady, fruity (predominantly) floral perfume with extraordinary silage (for at least 5 hours) and outstanding longevity (more than 10 hours and on fabric more than 20 hours). It is old fashioned, jammy and sour at times. Especially after 6 hours I felt the need to wash it off which I tried unsuccessfully. It was the sour tartiness that started to be disagreeable now and then after 6 hours. On my T-shirt however and after 20+ hours what I get is a sweet accord with a mellowed tartiness that is not sour. Overall, and regardless of the sourness that may be due to bad perfume-skin chemistry, AM is a (very) old-fashioned powerhouse that requires a lot of sampling before purchasing simply because it is very pungent and it can certainly be overpowering.