MyVolts Ripcord by waveformIRL
Sound Quality gets a 5 as it does not add any noise to the signal path from what I can tell.
Ease of use loses a point because you could damage your equipment if you plug in the wrong Voltage cable, or in rarer cases the wrong polarity.
Features get full marks due to the tip adapters available including the polarity reverser, and also the power tip which indicates the polarity.
Bang for buck gets full marks as the cables are quite affordable, far more affordable than original power supply wallwarts from manufacturers.