P.W.B. ELECTRONICS Smart Metal Cables ???

Has anyone here tried these cables yet, they are only $18 per meter? http://www.belt.demon.co.uk
The only product that I have tried from this company is their silver rainbow foil and this stuff really improved my system alot and it did not cost me one penny to get it! http://www.soundstage.com/synergize/synergize041999.htm