I find the air flow to be perfect for the way I vape. I can have it tight for a nice mouth-to-lung or when it's all the way open, gives the perfect (for me) restrictive direct to lung inhale with the supplied wide bore drip tip.
It actually took the guys at the B&M a bunch to finally talk me into one, I just didn't want to have to buy coils. I always wanted to get one of Zen's carto tanks though and before the Kubuki there was an adapter he made that retro'd the Nautilus coil into his Catro tank. What sealed the deal for me was when the guy at the B&M let me try his on a ZNA. Then, like I said above, I bought 1 then went back the next day for another lol...
Not sure about the juice but I believe it's 3, maybe 3.5 ml.
Don't want this to be a "gush fest" but I was really surprised with this atty. The only issue that I had was when my Ant mod tipped over (dang cat) on my desk and the quartz tank cracked. Since I use that mod as my daily carry, I replaced it with the stainless tank as pictured. I did also pick up another quartz tank too (for dress occasions

).