I really did have some good faith onto this tank. However, I was severely disappointed. However, I personally think it needs a lot of work. The design and concept is nice compared to my usual vivi nova. But personally, it's not worth the wallet being broken up by this product. Upon first try, they worked well on both tanks. But after the wick breaks further after 20-30 puffs, that's when it starts to build up juice up until mouth piece. Vapor gets cut down a lot due to the gurgle build up. Pros: Good vape, gives full taste texture, does not flood at the base. Produces well amount of vapor. Cons: Juice will gurgle up until mouth piece. Even vaping at a low exhale, juice will still come up. Until then, these has been thrown unto my 'do not order' list.