I had a full set of valhalla's here for audition not long after I was using the symphony-valkyre interconnects and speaker cables. I preffered the symphony interconnects to the valhalla's so it only seems clear that the pathfinders would best the valhalla's(to this listener anyway). Don't get me wrong it was pretty close, but when it came to a cable I would want in my system everyday it was the jena's by a little bit. Another listener in a different room with different equipment may feel exactly opposite. I preffered the more defined soundstage, blacker background and more accurate bass. The bass was the largest imrpovement, the others were less obvious- I am in a no way saying I didn't like the valhalla's because if I didn't have Jena's I would use them- they are very good!
Just like Frankg stated its not good to mix, on there own they were good, but when you put them together I did not like the results.
I have tried a lot of cables over the years and still prefer the Jena's they seem to do everything right.
As to Howard's comment about powercord upgrades vs. interconnect upgrades, I can say I noticed a very significant improvement with the pathfinders that I have NEVER experienced with pathfinders. The things that the pathfinder's added I have never heard from any cable or tweak before. Powercords do make a difference but its not the same as signal cables(IMO), they will allow you to adjust the sound to your desires, more of a tweak then an integral part of the system. I guess this falls into audiophile grey area, where you draw the line would souly depend on your experiences. While I have noticed improvements with powercords(sometimes significant) its not to the same degree as interconnects/speaker cables. Again this will be VERY system dependent.