The problem I have with the new Icecap design is more asthetic, who really wants warts on the sides of their tank? And the initial design appears that you will not have any real control over the direction of the flow, 90 degrees from the glass surface is all you get. The noise level of the impeller portion in the glass 'could' be quite loud, I suppose this is all speculation as everything will depend on the final design.

In direct comparison between the Seio's and Tunze, the flow patterns are almost identical (when you remove that 120 degree nozzle). They both are capable of moving a lot of water over large areas without that very laminar flow of other powerheads blasting everything in it's path.