I have had no real problems on my Sonic. There is a little fraying on some of the leading edge panel seams where it drags on the sand during self launch but other than that it is doing fine after 35 hours use (I keep records.

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I do agree that some of the bits and pieces are a bit clunky (the stopper ball thing is a waste of time and the wear patches are useless.) But there is nothing majorly wrong with the kite ... and there is heaps that is majorly good about it. I am very pleased that I chose it over a Crossbow.