For what it's worth, Dean made a set of crossovers for me using PIO caps and all I'll say is they surpass anything else I've tried in my Klipsch Heritage speakers. They sound open, dynamic and natural, without a hint of being overly bright. Every other capacitor I've tried sounded way too sterile. Dean's crossovers cured that problem! Dean knows how to build outstanding crossovers.
IMHO, if you want great tube gear, Craig's the guy. If you want great crossovers Dean's the guy. They both know how to make Klipsch Heritage speakers sound great!
Cheers!
Jeff