Having just purchased a speed 3 21m purple last year, which I adore, since I now am addicted to flysurfer products, what would be the main benefits I would see from upgrading to a 21m speed 4 when released in 2013/2014? Thanks for the useful answers to my other questions! It's great you guys do this.

Speed 3 Uneven Span Wise Bridle Shrinkage - should I be concerned? I have a 21m Speed 3 Purple Edition - love the kite and the mixer is keeping it flying nice. Have only had to replace the depower line so far. SPL's still have good adjustment in them. However I have a question for the future that is...