Hi Phil

In truth it is very hard to tell. You can't see or feel it work. All I can say is the sails are very very good and the reflex system certainly does no harm. I am just updating my sails to more reflex they feel more "slippy through the air" than most other race sails I have tried.

The reflex system allows you to have a lot of batten tension on the front 3/4 of the batten and less batten tension on the back of the batten which is claimed allows the sail to exhaust more efficiently. But it is not something you can see, there is no "oh look the reflex system has opened up". I have had Severne overdrives and NCX pro sails that also had the reflex system on them and again very nice sails but you can't tell how big a part the reflex system plays.