I have been trying out the Audyn True Copper caps to see how they stack up against the Jupiter Wax/Copper caps.
Some notes on the Audyns - they have very thick leads, so you may not be able to fit them through the through-holes in an amp or preamp. If you are good at soldering, you can just solder it directly to the trace, which is what I did. Also it is double-wound to lower induction and also nicely deals with resonances. It results in a really thick cap. Check the dimensions and make sure it'll actually fit in the space you have.
OK, the Audyn caps have finally burned in enough that I can give an idea of how they sound. They have absolute, perfect clarity, without any edge or spotlighting. Perfectly even tonal balance. As close to "not there" sounding as I've ever experienced. BUT, still missing the beauty/magic of the Jupiter copper caps.