After using regular heavy gauge wire and/or Monster cable for years, I bought the SP-6 speaker cables a few months ago. I also paid for the 480 hour burn-in service. These have really made my vintage system come alive. Every instrument and sound is clearer and more pronounced yet nothing crowds out anything else.
Customer service is also an important part of a purchase. I originally ordered a pair of SP-4 set of speaker cables then realized my system would cook them. The wattage rating was too low. Oops. This was on a Sunday. Immediately after I realized my error, I sent an email to the company explaining my dilemma. Within an hour, ON A SUNDAY, I received a reply from the owner. He said no problem, and cancelled my order. He also said IF I see anything that does suit my needs, go ahead and order it but no pressure whatsoever. I really appreciated that.