- You can make pleasantly drinkable product from an air still (albeit NOT quite what you will get from a good DIY build)
- Your time, effort and resources are probably better spent on a DIY build that suits where you are at in the hobby
(Caveat to above point: If you are just starting out and just want to see how this works and have a lack of material, skills and time then an air still *might* be useful for you)
Started out with the classic uninformed turbo wash and ran that through the air still as per instructions on the tin. HORRID STUFF COMES OUT

I made a tomato paste wash (a la bakers yeast) @ 14% (next one is 10%) and ran it through the air still, this time collecting in jars @ around 50mL per jar and lined them up. Did sniff and taste test right from these jars right after running and selected the "heart of the hearts". I was anti-greed and ruthless with the cuts so very little made it through. Diluted down to 40% and then tried to mix a drink from it.
I was actually really surprised at how smooth it was and how drinkable it was. There was a flavor to it but it was not objectionable and it was not over powering. It would be considered unsavory to the veterans I am sure but as far as if you could drink it I would have to say it would be a yes.
Now in the quest for quality over quantity this really leaves a lot to be desired, I ended up keeping about 150mL from the charge of 4L so the yield is very poor. The air still is a basic pot still so lots of head/tail smearing going on. Could have got more yield with airing out the jars for a day before testing as well I would imagine.
While I work on building something to suit my interests the air still experiments provide a decent bit of fun/learning in the meantime. While the air still is slow and crude it does have some potential as if a double distillation is done the quality/quantity goes up and once the wash and timing of running that wash is figured out you can run the whole process on a timer.
I can understand the disdain for this thing but I think it can be useful for learning about good washes / good cuts and how the process works in general.
The tripping points for a beginner (at least for me) is finding the parts (most not available locally or are REALLY expensive), the heater control has to be built to avoid cycling (hot plates = bad), the lid to the boiler needs to be sealed correctly, the head needs to be connected/sealed correctly to the boiler, the condenser needs to be built so vapor cannot escape and while rare the boiler needs some sort of over pressure protection. With some experience this is easy but just starting out everything is a question with MANY answers. I really want to try avoid having a flour paste mess everywhere every-time I run so while that can be a shortcut to getting up and running as quickly as possible I would prefer to find better joints to start with.
From the above if another person using this type of still ends up here wondering about the cut criteria the heads had a fruity taste and came with a burning sensation. The tails had the cardboard/wet dog taste. Any jar that had a perceptible sensation of this relative to the best jar (after smell/tasting ALL of them) was thrown out (and I found cleansing the palate between tastes to be helpful). Important to note relative here, if you use a full on DIY reflux setup run properly the "best jar" would still be considered well below sub par. But hey, never thought anything drinkable would come out the other end and it did...........