Plenty of air flow in fact so much that I had to close it off nearly 3/4 of the way. I have had it up as high as 150 watts easily but was very unnecessary with the e-juice i'm running 70/30 VG/PG (90 Watts is plenty). If I had to state a negative it's that the vapor is super hot after the first pull. If I stay with this tank (I bought the tank and 3 atomizers so i'm in for the long haul) i'll more than likely go in search of a 3Mg e-juice as it's giving me a head-rush if I even try to chain vape. Tank is solid and filling is easy. I've heard it stated that Aspire re-invented the cartomizer with this and being a 7 year vape veteran I can personally tell you that's exactly what it feels like except it works every time with consistency. The old days were not like this my friends. I've also seen some posts regarding leaking and I can tell you if you put it together correctly there's no issue however if you misalign get ready for a flood. Totally on me trying to fill it in the dark and just having gotten the tank didn't know what to watch out for or how it should feel if correct. i turned on the light and realized immediately what I'd done wrong and wha-lah, perfection..