I believe ISM to be the undisputed king of all iris fragrances - it's both rooty, earthy and yet with that touch of softness only iris fragrances have. I don't think I'm familiar with 'Listen', but even the better iris fragrances out there (Hiris, Bois d'Iris, Bois Farine, even Iris Pallida) that contain that that 'carrot root' type note aren't nearly as deep as ISM. The root element in ISM is quite strong. With respect to bell jars ISM is probably one of the more popular ones to have, but they're still hard to come by and expensive (I wish I had one!), so I don't know how easy it will be to find a trade. Good luck.