Thomas Jundt and his team have performed some trials with breeze sails on 23rd March (under the snow). He's keeping his #1 rig, but with a small main and a small jib (with a small square head) and the new boom (1.5 kg).
Data from this navigation (note that they were under powered, but for a trial in 4 degree ...) :
wind : 12-13 knots
Upwind : 14 knots / TWA 60°/ VMG 7 knots
Downwind : 17 knots / TWA 145°
you could see the three video done by Jean-Pierre Ziegert on the 18footer.tv website
http://www.18footer.tv/Development/tabid/564/Default.aspx
more info on AET's Blog
http://www2.jundt.ch/blog