I have a Zephyr and 4D -
The Z will fly in 5km/h (3.1mph) - fairly easily, with footwork and is quite trick capable in that range, for me.
My 4D only comes out when not much else will fly - its not very tricky either. I'm sure someone with more skill than me could get more than axles/540's/slides. But its indeed fun.
Are you looking for a low wind kite with full on trick capabilities? - or a low wind kite that will get you flying in next to no wind with less tricking ability?
The mongoose mentioned above over in the swap is a good deal - if you want a full sized UL trickster.