Well, they are good cables, but the objectives their cable trying to achieve can be had much cheaper.

They emphasis characteristic impedance of cable and how important it is to match it with speaker impedance. But truth of matter is that characteristic impedance of cable is not an issue with audio cables (speaker and IC cables). Speaker impedance will fluctuate wildly over audio range (going from 2 ohms to 16 ohms), and source impedance is usually less than 1 ohm. So trying to match a cable impedance with speaker and source impedance might be a little tricky.

Lower inductance and resistance that they also mentioned is good to have in a speaker wire. But there are several speaker wires out there (such as Canare 4s11) that not only have low inductance and resistance, but also are less susceptible to outside "noise". And they only cost about $1 a foot