$1539.00 Dollars for an IEC mains lead (£940 uk)doesnt make sense to me.
but one site tells me this lead will be so addictive i couldnt live without it.
That the improvements in sound are worth $1539!
They even have an accessorie for equipment with built in mains leads (often but not always cheap and nasty equipment)so you cut the lead near the equipment, wire up the adaptor socket then you could use the above lead and it would still make a massive difference.
They tell you on the site not to worry about the two inches or so of thin cable before it goes into the product it doesnt matter.

Now i understand RF interference travels down the mains and that suppressors and RF cores are good but in my opinion you cant justify $1539 for a mains lead even one that looks as good as that one.