I received my SmartCarts from GotVapes GotVapes SmartCart 2.0 - .9ml ClearTube Cart for 510 Atomizers [gotvapes-510smartcart1ml] - $4.99 : GotVapes.com, E-cigarette Supplies - Atomizers Cartomizers Mods Juice and more 2 days ago, and immidiately swapped out the filler with a small plug of blue foam and plugged it into a brand new 510 Atomizer with my EGO battery and cone. 48 hours later after 2 days of vaping perfection I am so happy! nice beautiful clouds of vapor with no liquid in my mouth and each time consistant vaping until the SmartCart is empty. This is GREAT! The only small complaint and it might be a good thing to some is that the SmartCart (at least on the atomizer I was using) fits very tight and at least at first it takes quite a tug to pull it off the atomizer for filling. I bought 2 five packs of SmartCarts for $5 each and as they are refillable with both liquid and blue foam this is quite economical especially if you have mastered a good technique for cleaning and maintaing your 510 atomizers. I'd like to hear from other SmartCart users to see if you are as thrilled with this product as I am. And I highly reccomend this combination of vaping to anyone that has not tried it!