On the SUL: 3mph with the tailweight & no walking, 2mph w/o the tailweight & no upper spreader & maybe a little walking.
That's pretty sad for an SUL. About equal to a std Exile.
The SUL goes way lower than the Exile standard. Back when I still had it, I used to fly the Exile UL when my son flew the FSUL, they both required about the same amount of wind. I can do sustainable 360s on mine even, so its pretty low. I am, however, done trying to quote actual mph values. I don't think you will find many other kites that will do all the tricks it does in such little wind - I haven't (but, then again, I have never flown a Ghost or a Sissy).
On the Standard, I agree with 4 for sweat-free flying.