The included 6.3-to-3.5 mm adapter arise along with the plug of a KH 10cm long construction in which I am afraid that they will eventually damaged their leverage connecting the FiiOs.
This cable, however seemed to be the better solution, because between the two ends of a cable adapter is. I am after extensive testing also very satisfied with the solution. Audio differences for adapter solution or operation without any adapter I could not determine, however, I must say that I do not believe in said "cable sound" and the like Voodoo.
And should the cable at some point give up his mind, it is bearable because of the low price, then I'll buy it easily again.