I haven't heard either but reading the web pages I would stick with what you have if you're happy, I imagine the upgrade will even deliver more and it's made in the USA.
Primaluna EVO 400 vs. stock Cary SLP-05 preamp?
I was considering the Cary Ultimate upgrade ($1600) for my SLP-05 preamp, but never did it. Now upgradeitis has me considering the Primaluna EVO 400 preamp as a replacement. Does anyone think that there would be a noticeable improvement with the EVO 400?