I use smoktech tanks (or atleast thats what I think they are not branded and picked them up at a local shop but they resemble them the most so I'm assuming thats what they are.) They are punched three times at the bottom of the carto and have the metal flanges, I got one of the smaller 3.5 ml I believe and a 6ml I think. They work amazing, been using the same cartos for about 2 weeks now, they give off amazing taste, great vapor and throat hit and I have fell in love with tank systems. I have heard a lot of good about the J tank and that is probably the next one I will pick up. I do want to try some CE2s though.
Smoktech DCT:
http://www.smoktech....x?GoodsID=10123
J Tank:
http://www.electroni...-TANK-p511.html