It's probably useful to look at which sails have been winning major championships with the leading sailors involved recently. There were no USA competitors in the recent Worlds so the USA produced sails haven't been tested yet against the traditionally fast sailmakers. The upcoming European Titles will be a good test as a number of new sails have been developed by Ashby and Brewin with bigger heads. 1100mm has been tried but they look like settling on 1m. General experience so far is that they are faster downwind but struggle a bit upwind. Head depth, draft positioning and batten profile and stiffness is being worked on to improve that area.

So in order here are the results from recent titles where either the sailmakers or leading users of their sails have performed. They are all the small head sails except where indicated:
Australian Nationals January 2009
Ashby
Brewin
Landenberger

Worlds January 2009
Ashby
Brewin
Landenberger

New South Wales State Titles March 2009
Brewin (BH)
Ashby
Brewin

Victorian State Titles
Ashby (BH)
Brewin (BH)
Brewin

Queensland State Titles April 2009
Brewin (BH)
Ashby
Landenberger

Cheers
John Dowling
AUS9