Interesting. I had a ballast puppy (640GPH) in my Supra that was hooked to a 370 pound tube sack. I had both the Rule 2000 (1200GPH) and a Attwood Tsunami (1200GPH) as over the side pumps to fill 750's.

From what I remember it took about the same amount of time for the impeller pump to fill a bag to about 350 as the aerators took to fill up the 750 bags. Of the two aerators, the Rule was actually faster than the Tsunami.

The impeller might have finished 350lbs a little before the aerator finished around 700lbs, but it certainly wasn't done in 1/2 the time of the aerator. So my first hand experience was that the aerators were significantly faster. I probably should have timed it to be more scientific, but honestly I just wanted to start surfing instead of documenting results...