The points made by AVGuy and RedKiwi are well taken. As a general rule, I never buy anything for my system without listening to it first in my system. Nonetheless, these forums are excellent places to get starting points for items to audition and a good complement to magazine reviews.
To that end, I just completed my audition of the new Shunyata Python and I am sad to report that it did not work well in my system. There was a distinct loss in soundstage and overall the sound was muffled with both my Wadia 850 and Pass X-150. To my ear, I liked the sound of the S/R A/C Master Coupler better and it is about a fifth of the price. Given my success with other X-Series S/R products, I think I will audition the new S/R Res. Ref. (X Series) power cord.