I agree that it is a shell of it's former self. I remember Eternity from 1989 when I helped launch it. It was stronger and less "chemical" smelling. I can't get the current juice to last on my skin no matter how much I apply. That is not the Eternity I fondly remember.
CK fragrances was bought by Unilever back in the late 90's I believe. I think thats when the formula changed. I was hoping when Coty bought it several years ago it would return to a more quality formulation, but sadly it is still weak. I still wear it as it will always be a favorite. Alas, I am glad I got to experience it when it was such a beautiful floral and woody creation ahead of it's time.