@Meerkat: Your statements are correct for Tube kites. The really big Tubes >20 sqm are extremly heave, slow and no fun to fly. And because of their weight, thats true that it is almost impossible to relaunch them.
But those statements do not apply for lightwind foils like a FS SA19 or even the S2 standard version. You can relaunch this kite even below 8 knots. It starts flying in 4 knots and is extremly stable in the air.
It is correct that you probably can not go for the really high jumps >5 m. But even in wind speeds to 15 knots you can go reasonably high, my own experience are 2,5 - 3 m but I am not too experienced. I guess an experienced kiter can easily reach 5 m in 15-17 knots with this kite. But on the other hand you have an extrem long hang time.
And according to speed. Thats right that a big kite is slower than a small one (thats physiks). But a FS SA19 (equivalent is a 26 sqm C shape) is as fast as an everage 16 Bow but with much more lowend.
And as Jacques mentioned, when a Tube kiter gets just enough wind to hold the line with a big board, the Foil kiter will start jumping and get going with a small board.
Have a look at the fotos I have posted before and look closer to the water, so that you get an impression how much wind there was. The third photo with the UG was taken at 5.22 pm close to Sydney Airport (15 Knots at this time).
Cheers
Granini