I just recently switched from a joye 510 with a chuck to VL4 cartomizers with my chuck and I will never go back to the 510.This combination gives me everything I could ever want.Excellent flavor,lots of vapor and long vaping life between refills.I just rinse the cartomizers out with warm water,blow them dry with an air compressor and refill them with my own liquid.I have been using just 2 cartomizers with different flavors for over 2 weeks now and they still perform like new.