I am new to all this and started with an eGo t-A & have used nothing else. I told my husband I wanted a ProVari & he ordered it. Now I have the most wonderful problem of learning what to do with it. Like I said I've never used anything but the eGo tank. The pro's of that have been fill and go without having to worry about having much with me. I have looked at some video of people using big glass tanks on top & I'm not sure I want to look at the juice all the time. I don't really understand about all of this equipment. I would really enjoy hearing from other's experience what works best.