The new Giro is much lighter and is similar in other respects. Great product overall but not the best for gram counters.

With it's extra long tail, the tip rest directly between my shoulder blades when down on the bars, ensuring that I remain in a perfect aero position.

If you're in the market for a TT helmet and you have a few bucks to spend, take a hard look at the LG Rocket. Very comfortable and very adjustable. The extra large flange almost rests on my back when in the proper TT position. The four vents heep your head cool without sacrificing too much speed. I was also looking at a LAS helmet but thought the Rocket was much better.