I've had my tank a few days, I love it !!! I had a bit of a time filling it the first few times, no matter what I did I ended up losing half the juice. What I was doing was inadvertently loosening the black plastic thing on the bottom - O ring ? when I pulled the cart out?? So once I figured that out it got a lot better. Watching the videos helped too.
I don't know if I'm stating the obvious, or if there is a reason not to do it this way, the vids don't say to, but I found if you just take the black top O ring off, it kind of twists off, you get much better access and you don't have to pull the cartomizer out from the bottom. You can just set the tank on a table and fill it without having to tilt it .