Very cool. Gotta get one. If they can make it more hydrodynamic, it will really speed up my times in the 200m fly.
BTW, my Masters swim coach holds the current world record for the 100m fly in the 65-69 age class. Just this past Saturday, he swam the 50m fly in a 50m pool, taking only one breath at the 2/3 point. (He figures that each breath costs him 1/3 second.) I'm not so brave. I took five or six breaths, and he beat me by over two seconds, even though I'm 20 years his junior!
Must... grow... gills...