Sorry but... I tried a few on them on several amps and gear and speakers in a mastering grade room.
If I can't hear a difference in this 6-figure+ room, I doubt anyone can ACTUALLY hear a difference in a living room / stage / whatever other noisy and/or un-treated location. I even did measurements for the non believers but that was just to show my peers the results.
Really wanted to hear a difference and it was fun to try a "high end" power cable but, I suppose my power is clean enough as is. After all I have a brand new and separated breaker box in my studio.
Also, the plug didn't properly stay plugged safely in many pieces of gear whereas other, cheaper power cables had a much better grip. Just sayin'
/my2cts