I have two Eternitys, one in drip mode and the other in tank mode. The drip mode works very well @ 30 drops (why stretch it?). In tank mode, if you pre-fill the drip well reservoir with about 30 drops and then put the tank on, the tank will not begin to feed until the drip well reservoir is well down ... this gives you the equivalent of about 2.5 ml—1 ml in the tank, and 1.5 ml in the drip well reservoir!
I've been experimenting with various wicks—3.5mm silica (for Ody & Penelope, from COV), cotton cheesecloth (30-35 threads seems about right), and bamboo thread (about 8 threads of Aunt Lydia's seems to work well)—and they all perform very nicely; if I anticipate vaping dark, heavy juices, I opt for the silica just for the ability to dry burn ... otherwise, with lighter juices where gunking up is less of a problem, I like the CC or bamboo for their taste transparency.
I'm getting excellent flavor and vapor in the drip mode, and I'm getting very nearly the same results in tank mode with CC or bamboo wicks. I have had absolutely zero leaking in either mode; in fact, my out-and-about setup is a tank mode Eternity on top of a 1000 mAh SS eGo Twist. Very elegant looking, and quite pocketable. I might also mention that my dripping Eternity is atop my SS Zmax v2, and the combination looks gorgeous! The Eternity bottom cone slips into the Zmax drip well for a perfect, integrated mate to the Eternity ... unlike on the Twist, the Eternity cone doesn't screw onto the Zmax; it just slips down over the 510 connector into the drip well, which is the perfect depth to accept it.
I'm using both 33 gauge and 36 gauge Kanthal A-1 for coils, which I usually wrap for 2.5–3.5Ω and vape at about 6.5 Watts. One recommendation: get some of the pre-made wick & coils ... get them not so much for the silica and wire, but for the two little metal post clips that are included. These little devils are very easy to lose (they seem to squirt out of my juicy fingers and fly away, never again to be seen), and you'll want a few spares lying around.
I'm quite happy with the Eternitys, and they're giving me really brilliant performance. Now, if I could figure out one simple thing, I'd be a totally happy camper ... how in thunder do you remove/replace the little section of silica wick inside the spike? You want it out for dripping, but it's essential for tank mode. Anyone get this figured out yet?