The length is good sized, although I would have liked to have had a 20 cm long cable. But now I've just come to expect this during operation on a notebook.
For mobile use on a smartphone (Samsung Note 2), however, I've a silver USB cable brought by Lindy (20 cm) (searches for Lindy USB cable transparent).
Sidenote: even if the Lindy cable is not optically processed so noble, I can sound no difference to ViaBlue notice (tested with Ultrasone Signature Pro); neither PC nor for Smartphone.
Nevertheless, this cable has a great price-performance ratio. Priced it is anyway unbeatable. Other suppliers of "high end" cables here are far above the 100 euro mark for a similar cable (without being better, but with plenty of Voodoo which relate to the materials, etc.).
So if you like me looking for a USB connection appealing at a fair price, will find it here in any case.