Now i've had a few sails (haven't got much work done this week) I feel I can give a more accurate assessment
It's definatly quicker than a flow, gybes the same (but thats what I wanted), still a comfortable ride in the bumps but has a very different sound (so what)
Only downside, because it's so light every time I have a swim the umbilical flips the board over! Used to happen sometimes on the old board, but it's no big deal, just have to get a softer uni joint. I'm thrilled with it

I will get some photos in action when I can con someone into walking out on the sandbar to snap me