2 words, buy authentic. Personal experience, but I bought some clone bvc aspire heads from ft. Every single one in the 5 pack tasted immediately (first hit, lowest voltage) burnt. Spend the extra few bucks, buy authentic. Seeing a lot of clone suntank heads on there among others, my personal recommendations, just buy authentic. Maybe there's a magic way to prime these clones v the originals, who knows. I fill my tanks with a new head and let them sit for hrs, usually as i sleep. Then some primer puffs, then I vape. Got better after the first hit, but the flavor is just nowhere near the same. I had a clone evod head once light red hot, like no wick whatsoever, just straight coil. Thought I'd try the aspire clones once, and only once. Lessons learned from me.