In my experience, the performance benifits gained from various line conditioners and power cords varies with different systems and power lines.
I used both the 85.1, and the 60 series cords for quite a while in my system. They cleaned up some low level noise that I wasn't even aware was present. The sound seemed cleaner, with better definition. (especially in the low bass)
The only other line conditioner that I was able to compair directly with the 85.1 was the Monster HTS-2000. The 85.1 out-performed it, but at three times the price, you would expect it to. The difference was there, but wasn't of a jaw-dropping magnititude.
I was able to compair the BC62 cords directly with the Acoustic Zen Tsunami/Krakatoa, Synergistic Master Coupler, Mapleshade Double Helix, and JPS Power AC. I found them to be better than all but the Krakatoa, and a toss-up with the JPS.
The system consists of the Arcam FMJ CD23, Blue Circle BC3 Galatea, BC22 power amp, and Spendor SP 1/2. I have recently upgraded the amp to the superb Aloia ST 13.01 with the inductive power supply option. I still use the BC62's on the CDP and preamp, but have found the Aloia to be immune to any power cords I have tried. It is also the only amp I have tried, that sounds better with no line conditioning. This is likely due to the inductive power supply. The Blue Circle cords and 85.1 made clear improvements in my system, but not the kind of difference that would make you rise from your chair and yell "Holy Crap"! No powerline products have done that for me. They are simply good probucts at a fair price, and will compete with anything in their price range.