Veritas has surely left the door open for debate on this. In their own words "...We've never encountered another cable type where length impacts performance to such a large degree. After trying many different ideas and mostly failing to achieve the goal, our solution was to use two completely different cable designs to overcome those differences. Thus we end up with the Optimus 50 - a 50cm cable (aka .5 meters), and the Optimus 100 - a 100cm version (aka 1 meter). Different looks, different internals, but the same performance and the same price." Hmmm, I bet somebody will hear a difference, but until someone lake v-fi steps-up to test them back-to-back, we won't know.
Everyone says shorter is better, but it would be hard to turn down a longer length for the same money if they indeed sound identical.