I was a carto/tank user for a couple of yrs and could find nothing better.Tries all the top & bottom wick units but they just didn't work for me.
I started using the Asire BDC a few months back and, to me, there the best thing since pockets on a shirt.
They do mute the juice flavor a "little" but that's acceptable considering their reliability/longevity.
They are easily cleaned by soaking in everclear over night. I have yet to get a bad coil(have used at least 50) or even have one just out & out fail. The resistance just increases until there no longer useable.
Sure Vapes has a good price and the free shipping is a great bonus.
Reviewed by: Joe from IL..