Let me pop one on the Darwin and answer you honestly...
The draw is tighter, almost like sucking smoke from a cigarette tight (vs. sucking a golf ball through a straw tight). I kinda like this about them and I'm sure it has something to do with the way the air flows through the thing - the design of it - and as a result I (and your mileage may vary) don't get plumey plumes of vapor. I get reasonable and satisfactory streams of vapor with a 70/30 (VG/PG) juice. Ceramic cartos provide more vapor but not as much throat hit, imo, as a G5.
Vapor - 90%
Throat hit -
Battery life - lower pixies or volts probably equals longer battery life
Edit: actually, I'm not sure that was fair. I was using a new one I'd just filled with a new juice and after a few more drags got great ervapor production. These aren't at all shabby! And monitoring the juice level without worrying about the tube cracking is damn cool.
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