Last played with the 3ohm 901 atty. But to be honest, I am not in love with that setup on the Darwin. Decent vape, slightly better taste and lessened TH. Has to be juiced almost as much as a 510, so no advantage there. I just got bored with it.
I started to try the Golden Green Automatic Feed System (GG-AFS) 2nd version for all mods. Bought it some 9-10 months ago to go with my GG Telescoping System (GGTS) mod. The AFS is a feed system that uses gravity and air pressure to feed juice to a 901 atty secured to a tank full of ejuice. A control ring at the bottom of the mod allows you to fine tune the atty/juice ratio of the mod like an old fashioned automobile carburetor. I moved on to the AVS made by GG specifically for the GGTS, but intuitively held onto my 'all mods'. I even held onto a used but serviceable 6v 901 atty made by GG specifically for the AFSv2, the i6.
Fortunately, I have a good 510 to 901 adapter, so it was pretty simple to attach the AFS to the Darwin. The atty connection can't be swiveled all the way down with the mod, so it cannot be turned off. This doesn't look like it should pose a problem as the button requires too firm of a press to prevent an accidental misfire, and the LCD screen staying on should have a negligible impact on battery life. The AFS looks off center and out of place on the Darwin, but still allows the mod to stand upright.
I'm still trying to decide what to think about this setup on the Darwin. It has a lot of good things going for it: 5-6ml juice storage, a good taste and decent TH when matched up with a HV 901, and almost effortless vaping if everything is working right. Once properly set up and adjusted, simply inhaling draws the right amount of juice into the atty from the tank. The control ring allows me to fine tune the amount of juice being taken into the atty with every inhale, which can help to compensate for different voltages, juice viscosities, and what kind of draw I happen to be using at the moment. Finally, the juice in the tank can help the atty from overheating from use, similar to putting a fuel pump in the middle of a gas tank on a car.
But it's not quite perfect. When using attys on the AFS instead of perforated KR808D-1 cartos, the it has a tendency to seep or outright leak ejuice. (To be honest, minimal seepage is still an improvement over spillage and seepage I experienced manually dripping attys and cartos.) The AFS can be finicky to be point of being temperamental if it is not properly assembled and cleaned.
These traits, along with fine tuning the control ring, does add an element of complexity not present with simply dripping an atomizer.
It's the age old tug of war between having precise control versus enjoying simplicity. And to a certain degree, it's fairly subjective: some vapers want to be able to simply hit a button and get a vape, others would rather fiddle with a couple of settings to get the perfect vape. The electronics and interface of the Darwin strikes a nice balance between these two opposites, and I'm not sure how the AFS will affect that in daily use. At least the Darwin can easily switch between many atty/carto/juicing options, just not all of them perfectly.
Fortunately in the case of this review, the recent blizzard in reddirtland will confine me to my house for at least another day, and give me the opportunity to experience this setup in detail. I'll report back on later on in the day on its general usability, vaping experience, seepage and/or leakage issues, and battery life. Presuming of course I don't die of a nicotine overdose in the meanwhile.
And before you say it, I'm well aware that there's a new version of the AFS. However the v3 is a) larger than the v2, b) out of stock, and c) has a list price of $92.00 plus shipping. Cleaomizers are on the way, and I'd really like to try the Map Tank Mod and the Ato-miser, but spending almost a car payment on vaping in a month is bad enough; a few more add ons will take me into house payment territory.