I love to fly the PD SUL on 30 ft lines in almost no wind. And yes like Rob said it will fly in 1 mph with little effort. 360’s are easier on the 30 foot lines except I usually fly on the beach and dry sand makes it a little more difficult. I have not flown the Echo but have a 4D, but don’t fly it much. Several times I’ve thought about buying an Echo but have other kites for that wind range, Sky burner Delta Drive UL and a Mamba UL so don’t really have a need for another. I haven’t tried the Kaiju outdoors but enjoy it indoors more than the 4D.