This thing is really easy to use and let's me run my vape pen through a bong! I love it! Vape pens aren't my favourite, but they're handy. Even the top quality vape cart from my medical supplier still tastes a bit weird to me and hits differently than even smoking does (i.e. I usually find vape liquids harsher than smoking). This adds an extra layer of filtre to make vaping a bit smoother. Super easy to figure out and makes the vape a bit nicer.