I ride a 66" SR2, with the carbon fin on stock settings + a front ventral. My front binding is just forward of the recommended binding placement line on the ski.
I cannot fault the ski, it seems to match my technique perfectly.
I'm a full pass better on this ski vs my old Sixam SS (14m @ 58kph). Sure it is fast, but I love how much confidence it gives you in the turn - I can't think of an area you could improve the ski. It's awesome.
When I open water skied after I first got the ski I struggled with the pre-turn, as I couldn't get my head around the extra speed I was generating through the wakes. This would result in me trying to initiate the edge change too early, and copping a heap of slack rope. But now I've got used to the speed and use better handle control in the edge change, it's unreal.