I have an awesome vape shop near me, with a very cool tasting wall, but everything on the wall is 9mg-12mg strength. The owner frequently has me try whatever he is vaping in 6mg, but he is also using a sub ohm rda. I'm impatient and went ahead and signed up for the standard box at 6 mg. If it doesn't work for me in my carto tank, I will use his RDA to try them out. Once they add 12mg strength, I will probably upgrade to gold.