Here is a shot of the #3 rated at 850gph
Compared against the Maxi-jet I have this thing really puts out the flow and it seems to be a much wider flow pattern.
Observations so far...
Both powerheads took a little work to get spinning, one was shipped with the prop out of the center support. Easy to fix by popping off the cover and realigning. Both took a little spin with my finger to start turning. The magnets aren't overly powerful, but strong enough to hold it in place. The back magnet did require support when repositioning as it fell off sever times while trying to swing the head into position.
I think for the price, thery are very nice