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Matt Snowdon said......No more sigma shape ...

Well I don't agree with you, I had 06 slingshot fuel, 07 best nemesis, 08 helix, 09 cult and 09 core GT.
Sigma shape have two centers of power and it makes it more predictable.
All the other kites have one center of power on the center of the wing but sigma creates two power centers and it reduce the chance of change of direction during a cross wind gust or rotating under the kite during the jump as most of the times your kite and your bar are parallel.
While we are talking about bar, what I love about core bar is:
1) you don't need any setup for unhook
2) If your chicken loop get out of the harness hook by accident or you use the safety release, you can hook back in EASY in the water.
What I don't like is:
1) that small power hook which most of the times get hooked when you don't want it.
I hope Naish look at core's bar and change their bars a little bit.