The videos with NASA stars show these are stable kites which make me think that these are excellent and good value for money. Would a NASA Star4 in 4 or even 5.5 metres be good choices. Would I need at least a 5.5 metres. I have reorganised my Peter Lynn buggy and put a Kayak Seat “Seak”, tied to the side rails with steel hose clamps, once the straps are adjusted correctly, It feels much better, with a good back rest, a bit on the side which stabilises the body.