For me its disapointing, specially with all the hype its goin out on the web about this cooler. I was hopping performance close or better than silver arrow / genesis.
Because of its variable fin spacing design, it seems designed to provide highest performance with high airflow. From their web site:
The individual tower stack is separated into two sections, the loose air intake and the high density exhaust section. By the laws of fluid dynamics, the increase in fin count in the exhaust section squeezes airflow and increases exhaust air speed. The increase of airflow speed in our Jet Fin Acceleration System™ allows heated air leave the tower faster.
and from a recent email exchange w/ them:
Due to fin gap design, they need the extra rpm to get air into the thinner gaps. And we also modeled the fans blade shape to fit this purpose as well.
Our comparison tables start at 20 dBA and go down from there, which means we're looking at way below their peak efficiency. Maybe have a look at performance differences at maximum airflow -- we haven't, but the data is there in our reviews.