Tried the Serenity yesterday with a rather old 6.3 Mistal soft sail. I beleive this probably was the type of sail used on the old Superlights. It did seem to work pretty well. Wind was probably less than 7 mph most the time. The sail seemed pretty powerful (very full all the way to the top) and I noticed tacks seemed easier than my other sails (I suspect because the COE is further back.) I think the biggest problem with this sail was lack of stability as wind increased, but that's not so much of an issue with Serenity. Of course, its pretty hard to tell much from one session, particularly when it was the only sail used. Anyone else tried something similar?