Question for Audio Research Ref 5 owners ?

I have used Shunyata Python Helix alpha with the REF5, but upgraded to Anaconda Helix alpha for the the Anniversary REF40.

I've used a Nordost Valhalla and a Silent Source Signature PC with excellent results and the difference was not vast but, I've heard ARC uses Shunyata. As with all things audio what works in my system may not work as well in yours.