Check out the viddes from Pbusardo and Grimmgreen on Youtube, they both do very detailed
reviews on them, and how to use them.
I'm a new convert, I got some
smok dripping attys, and love them, so I can only imagine how good the HH.357s are, or the Ikenvape ones are. I don't do anything special, just 4-5 drops, vape away! They're great for the small sample bottles I got. And when I'm not using it, I just throw the rubber condom back on it, and throw it in my stash box. Great flavor, great vapor production.
The irony is they're old school now, and everything out there replaced them. 2 of my local shops don't even carry them anymore. I totally get how carto
tanks and ProTanks and all the other devices are better, but sometimes I just want a quick toot of a flavor, and they're perfect for that - no rebuilding, no tweaking, just drip and go. Mine were only a couple bucks each, not $22 like the HH's, so when they go, I'll just toss 'em.