G'day Dave, I agree with the reccommendation of not using the GT in the dunes mate, You would remember first hand how I fly with my old Raptors, and I still love them dearly. I am looking for a replacement for my tired old 6.5 and was given the 6.8 GT to try out.
On the beach with a steady breeze I would have to say the GT's are a magic kite to play with and it really performed well in the races on the weekend, yes I finnished fourth, but every kite ahead of me was bigger than 6.8 so I wasn't dissappointed at all.
However, previous testing of the GT has been inland with lumpy wind conditions and it really takes some input to prevent it from collapse or the dreaded bowtie, similar to the old Yak's. I would hazzard a guess and say it would be bordering on dangerous in the dunes, even with the armour you wear.
Neil Duke
P.S. Say Hi to Brig for me, Cheers, mate