Brobru,
I say it is a better system FOR ME.
You know how it is when you try something out-of-the-box, some people laugh and some want to try it.
I have heard other sailors complain about tennis elbow, but I don't get it anymore.
I am glad to hear that a group of sailors as competetive and well respected as the Aussie 4.9s do it too.

Steve,
Exactly! I still remember the article on Cogito, the current Little Americas Cup holder.
They said they would test parts and keep making them lighter until they broke, then they would know the limits.

The 29mm blocks are only rated at 990lbs working load and 2000lbs breaking strength.
Because of the smaller righting moment on a singlehanded boat, I think the 990 is adequate.
A big, doublehanded boat can generate much more stress on the main sheet.
They may require the 40mm blocks with 1455lbs working load and 3050lbs breaking strength.

The 29s do run incredibly quick.