Still not sure if the current crop of bikes offer a big enough improvement over my Plasma 3 for Time Trials (though the integrated drink/storage solutions would be a plus for 50mile + TT's).
From watching one in action the lack of rear wheel stiffness / possible power loss would be a worry for shorter events with a Dimond or similar beam bike, but potential fatigue saving a plus for longer races.
How do you lose power riding in a straight line even if there is BB flex. There will be no loss of power to the rear wheel when going in a straight line. You could literally ride on a noodle (anyone remember the slingshot) and have no power loss from the crank to the rear wheel. 99.999% of tri riding is straight line riding...there were even pros riding these things and racing competitively when they were out.