Among other possible advantages to carto-tanks, what I'm really digging is the ability to drip juice into the carto, thus adding flavor without it being dispersed into the whole tank. This way I can try mixing another flavor in without it immediately being blended in with the rest like it would, for example, in a Protank or iClear. It's kinda nice. I'm adding a few drops of whipped cream here and some other flavors there. They stay, more or less, concentrated, and that simply isn't an option with other delivery devices. Plus, I think that the aroma in the carto tank also adds to the taste experience since smell and taste are so closely connected. Cool!