I am currently using an agr carto tank with boge cartos. I am very happy with the performance, however i am very rough on my ecig and have cracked 2 of the acrylic tanks. I'm looking for something similar that i can use my boge cartos with but with metal tanks. I have found a few but they are very expensive. I don't mind paying for quality, but it feels like a rip off to pay 50 or 60 dollars for a tiny metal tube.