I run a madvapes dc 3ohm 5ml carto tank on my 5v box, and i love it. My only minor beef was the sliding, but with a big belly or a ming drip tip on the top the tank sits flush between the flange n the dt. The syringe fill isnt necesarry, pull the tip, slide the tank till the carto is just below the rubber and run juice down the side. Slide the tank down, put your tip on and vape.