"The Spark cable delivers a big, edgy sound, a nitrous tone, and hellfire attack with high frequencies keeping full harmonic detail."

A nitrous tone? Ah the sweet sweet sounds of Nitrogen in a trivalent state with Oxygen.

I ran N2O for a little while in a street racer. It sounds like money being spent at a very rapid rate

On topic though, I try to resist the gimmicks these days, but when I first started playing, I admit to buying all kinds of sprays and potions to make my fingers "glide up and down the fret board" Years later, I'm realizing that the only thing that toughens your fingertips and helps you fly up and down the fret board faster is practice. (and some delicate use of a scotchbrite on glossy necks).