I find it really hard to judge the flow from the stream style pumps.
The resun pushes more than a maxi-jet 1200 that I modded, but I doubt it's close to 4000 GPH. 2000-3000 is probably more accurate.
The real problem with these pumps is the limitations imposed by the controller. 3000 GPH is a lot of flow, but if the pump only does that much for 8 seconds, then that's not enough time to really get the tank water moving.
I’ve got a 120 and the flow from the pump doesn’t have a chance to get the water moving on the far end of the tank before the controller kicks the pump down to the lowest setting.
As Straegen suggested, I might just do away with the controller all together, but then I’d have a 3000 GPH pump that draws 30 watts. Not really all that efficient.
They aren’t bad pumps, especially for the money, but I think they are better suited for a smaller tank.