At first, I thought the tank system was great. For about a half hour. Then it started to taste burnt, then no vape at all. I rinsed them out, and still the same thing once they dried. I discovered how to fill the empty cartos that I had saved from my envy with they syringe that was included in my bag o goodies. I even read on here how to clean the atty with baking soda and white vinegar. Still the same thing. Then I remembered reading that you need to put some juice on the atty first. I thought, What have I got to lose? Now it vapes beautifully. I also read to pop the top off of the cartos to fill them. I did that, threw away the plastic thing between the wick and the top, and just dripped directly onto the wick. Im going to see how long each one lasts now.