Alex, sorry but it's difficult for me to recall exactly all the improvements I noticed. Primarily because within a week or so after the PN burn-in, I received my new Audience Au24's sc's, and then a week or so later, my DNA-2 Rev A amplifier.
And those last two upgrades were substantially greater improvements than the HT to PN upgrade and that is where most of my memory lies.
Specifically I only recall a decent improvement in the bass regions, (a bit tighter and more pronounced) and a better articulation in the mids and highs along with a little better dynamic presentation.
In time past, I had never been one to notice night and day differences in cabling. Whether ic or sc. It's always been on the oh-so-subtle and very micro micro-dynamic levels and sometimes not hearing any differences. Only exception being the Analysis Plus 9's which simply were the worst sc's I've ever heard in my system.
The PN's sonic improvements were definitely more than subtle. I also recall there was not much improvement until about the 7th or 8th day. Almost to the hour of what PN recommends for burn-in time.
As a friend once said "if it's not a substantial improvement where you find yourself enjoying the music much more, it's not worth doing."
I like that and try to follow that philosophy now.
With that said, (set pricing aside for moment), sonically the Pure Note Epsilons just barely fit into that substantial improvement category. But when you include Pure Notes price comparisons, it is most definitely a worthwhile upgrade. Because the PN's actually cost less if you compare new prices.
Now, in comparison, the Audience Au24 sc's are so sonically superior to my previous sc's, that I easily would consider them worth the upgrade regardless of price.
The difference in the prices of selling my previous cables and purchasing the new cables was absolutely negligible.
And that made it very much worth the effort.
It's not much info, it's 1:30 a.m., but I hope it helps.
BTW, how's that new pre-amp working? And do you still have the old one?
-IMO