Grannyring, I have compared PathAudio and CAST resistors in my high-pass crossover. They both sound good but quite different. I only have one value of PathAudio which means I have only tried it in one spot but it's a critical place---the shunt side of the attenuation network which follows the crossover cap and choke. In this spot, I prefer the PathAudio. It is very clean and detailed and it has excellent bass (yes, the tweeter components affect the bass). At least initially the PathAudio is dark and recessed in the mids, but both of those colorations seem to fade away with more use. The CAST also has excellent detail and it may be even more dynamic, but the CAST resistor has several tonal irregularities---a projection in the upper mids and a serious rolloff in the bass. The treble on the CAST is also rather wispy. Be aware that both of these resistors take a very long time to settle in. The PathAudio supposedly requires several hundred hours. I don't have that many yet so it may get even better.
I use a total of 4 resistors in my high-pass crossover, and I have tried Mills, CAST, regular Duelunds and AudioNote tantalums in most of these spots. As of today I prefer a mix of Mills wirewound for the two series resistors, and one CAST and one PathAudio for the two shunt resistors.
By the way, regular Duelunds do not sound at all like CAST. They have excessive warmth and a severe rolloff in the highs, virtually the opposite of CAST resistors.