If you are speaking of the Nautilus and its BVCs, I thought the combination was "moody". To me it seemed the air vacuum would change and excess juice would get to the coil (flooding) or not enough juice got to the coil, which is to little air.
Then I read on here about not tightening down the glass so much on the rubber seal and the same for the cap on the tank. That did help. I have moved on, but the Nautilus worked well and had good flavor.
I still recommend it because of simpleness and quality flavor. It just takes a bit to get used to its personality. It has a little more than others, that's all.