Actually, I looked and back on Nov. 10th I was sailing the Serenity with the Severne Glide 7.5 (designed to power the Serenity I believe) in a measure 4-6 knots of wind, diminishing to alomost 0 knots at the end.
Many of the individual GPS legs were in the 5-6 knot range so I'm pretty sure the Serenity was going at or slightly faster than windspeed and up at least higher than 45 deg. off the true wind.
It was pretty amazing that as the wind diminished to almost zero the speeds came down, but the board was still making 0.5-2.0 knots on the legs.
Wish I had a way to "publish" the tracks to those interested.
I have it in GPS Trackmaker and Garmin Mapsource.