I bought a MAP DCT tank a couple of months ago and gave up because the juice was constantly spitting up into my mouth. I was using it on my 5 volt HP Saber with cartos I punched and bought that were pre punched. 1 Success out of 8. I think the vg/pg on the one that worked was a 30/70pg. I like my juice at 60/40pg or 70/30pg. Im willing to give cartos another shot.