My Darwin arrived Wednesday; Today is Sunday, so I've had a few days to gather impressions. On that basis, I can best sum the device up as follows: It's everything it's been cracked up to be.
My apologies to Canon here, but operation of the Darwin is so advanced it's simple. Within the recesses of contours machined into the body—which makes finding them easy, even if blindfolded—there's a fire button and a thumbwheel; rotating the latter adjusts the desired Wattage, the numeric value of which is displayed on a small LCD panel along with voltage, current and—this, to wit, is what separates the Darwin from all others—the measured resistance of whatever atomizer you have attached.
I've verified the Darwin's Ohm reportage against my Fluke multimeter, and they sang two-part harmony from the same hymnal every time; that's important, because transitioning to Darwinism means untying your Voltage mooring point and thinking in terms of Watts. An accurate resistance reading is the beacon that will lead you back to your sweet spot, albeit from the opposite direction.
While on the subject of matters electrical, I've been vaping from this gizmo for roughly four full days, and I've recharged the batteries once. The current state of charge is also displayed in LCD cartoon symbology, but it decreases so slowly I feared it wasn't working; it's working fine. Suffice it to say that carrying a spare set of batteries is one less item on my before-I-leave-the-house checklist, as I’ve been thinking in terms of days-per-charge, as opposed to charges-per-day.
A note on physical size, a matter which I’ve seen a certain amount of whining expressed: with an Ikenvape 801 Fushion & adaptor installed, the whole works is 8” long. That’s big, but keep in mind the collapsibility factor; with the atomizer (or carto) pivoted out of the way, mine measures a shirt-pocketable 5.625”. That’s considerably less than a Silver Bullet or Buzz with the same carto/adaptor combination attached.
Regarding cosmetics, this is a love-it or hate-it affair, a visceral thing I couldn’t talk anyone in or out of anyway. There’s this, however: if you’re a stealth vaper and you’re ever caught, resorting to the it’s a medical vaporizer defense would be far more plausible with a Darwin than any PV I know of.
All thumbs of consequence are pointing skyward, but no self-respecting reviewer could let even the Darwin off without fault-finding of some kind, no matter how frivolous or entirely personal—and fully my own point-of-view—is my perception that the Darwin is best used as a cartomizer-only PV; there’s no pretense made of a spill cup, and I tend toward messiness when dripping. It’s not hard for me to imagine wayward juice squeezing past the rotating shaft onto which the atomizer mounts, then raising hell with the electronics once inside. I could easily be wrong about that, but the Darwin is too fine an instrument for me to subject it to even the possibility.
The other matter is more objective: the Watts readout bears watching, because the thumbwheel moves easily enough for unintended adjustments to occur—at least within the confines of a shirt pocket, for instance.
That said—and my self-respect intact—there’s little room for debate as to whether or not the Darwin is the vaping state-of-the-art as we know it; it doesn’t even leave much room for conjecture as to where things could possibly go next.