I have a 1500, 820, etc., I kinda like like the flow, like others have said, it's not a pressure flow like MJ's, I got everything dancing in my tank, which is what I wanted, except for my crocea, even though there suppose to be the one clam that can handle more flow, mine has turned and adjusted itself, I think there was a little too much flapping of the outer mantle.
One thing I didn't check with the Seio's, maybe someone can advise, when they come out of the box, are they already set for maximum flow?, I didn't even check., I would think they are cause I'm getting pretty decent movement.
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