Prior to owning the VD Power 3's my reasoning went like this:
I've got a power conditioner (Monster HTS1100), so I'm feeding my components clean power-- why do I need a fancy power cord? At $50 I decided to take a chance on the VD cords, I mean "what the heck". Check out the VD thread to see my reaction. I am now awaiting delivery of VD's top-of-the-line power cords.
IMO, the $50 VD power cords made more than double the difference made by the power conditioner. Believe it!