i have the 2.0 and 2.5 vivi novas, as well as a few dct tanks, i use the vivi's more and the 2.5(longer wicks) is my go to. very solid vapor production, flavor is very clean and not muted, and th is the only thing that slightly lacks as they taste burnt when you turn the voltage up. when i want to feel a strong kick i just switch back to a 2.0 dcc tank and push it at 6v's. then i simply return to the vivi for the remainder of my nic needs