At first it was once a week. Then it was 2-3 weeks. Now it's never again. Once you try some high end juice you won't want to use the V4L stuff. I actually cleaned out a bunch of prefilled cartos because they tasted like solvent after using a quality juice,and I know I'm not the only one. The batteries are decent,but you never know what you're getting in the draw department...vent holes vary. The cartomizers need better quality control! Some just don't work right,and you get juice in your mouth. Some just die all the sudden. Some have issues threading on the battery correctly. V4L is consistently inconsistent. I'm sure most will eventually move on to better equipment/liquid.
I'm tired of you...why dont you move on?