I am thinking of ordering the precise from Super T. I wanted to know if anyone knows if the V4L carts are compatible. Does anyone know if they are 901 or 501 compatible. The precise comes with either 501 to 901 or 501 to 801. I don't know which the V4L is so I don't know which to ask for. I like the carts and have not used the atomizer yet but might in the future. Also what atomizer would be best. Heard something about low resistance atomizers better with big battery ecig. If I decide to do an atomizer with this what would be best and what pieces do I need and where should I get them from.