I love the Kaiju on light wind days. If wind is too weak to hold up other kites I can still fly the Kaiju. If it goes completely calm I can switch to indoor techniques but I rarely need to. At first I wasn't sure it could handle it, so I bought a second for outdoor flying, then within a month I won my third. Now I have two I fly outside whenever winds get light, plus one I fly indoors.
Usually I set one up after my Djinn or Rev is struggling to fly, and keep at it until somewhat beyond the kite's rated maximum.
My only difficulty in light wind is forgetting the nature of the kite. Too often I have tried to pop a trick or get a tight hairpin turn, and instead have a spar pop out from the stress. While I have not broken one yet, one of the leading edge ferrules is somewhat bent on one of my kites. There have been many times I was certain I broke something only to see one (or rarely TWO) spars popped out. I have had three times going out into the water accidentally, one I was sure was broken but by luck my wife found the lost spar in the waist-deep water, not broken. I would not do it intentionally but I have seen them hold up to the stress of underwater flying.
I have found up to about 5 mph and a little stronger it can be a great lazy kite. I can sit in a chair, hook lines on two fingers, and casually fly one handed. 30' to 50' works great for that. It requires very little input for basic control.