I don't have leaking with it.. HOWEVER - the tank isn't seated, (like the Kabuki for instance) meaning, that when you take it apart to rewick and clean the coil you have to be careful about that glass. If you get it back together and the glass isn't just right you'll get leaking...
Also, you cannot keep ejuice in the tank when you rewick.. every time you have to get to the base there is no way to keep juice in it.. again, because they didn't make a design that actually seats that glass.
However, when you have it together correctly it won't matter what you do, I don't get a drop of leaking. .
The seating issue IS an issue and can make it a bit of a PITA at times, especially if you rewick often .
What I am hoping for is a version two on that where they actually design it just a little better... I do absolutely LOVE the tank though.