@holco, I upgraded for that very reason even though I had my R8 nicely burned in and performing at an optimal level. It sounded just amazing...but it has a new home now and I'm busy burning in my R7 MKII along w/ my After Dark Emperor 10mhz clock...because it's early days in the burn in process, I can't say it's significantly better - at 265hrs so far, it's for sure coming around and I know it will take another 250hrs to get it somewhat optimal...my target is actually 1500hrs with any AGD product...is it worth the upgrade? I would say yes, particularly if you're adding an external clock. I have also have the DI-20 & Ether-Regen paired with matching clocks so my system is sounding pretty amazing right now...but as
@FredA can tell you, I've messaged him many times that I wanted to throw it out the window because somedays it just sounded awful (relatively speaking of course!). Fortunately he told me to stay the course and yep, he was right...it just gets better. On a side note, I've stayed away from any AGD HE products simply because I have a PS Audio Power Plant (PS1000) w/ regenerative power supply connected to dedicated AC circuits...although I still recommend good LPS's for any external clock. But a lot of folks swear by the R7HE MKII so give that consideration before you upgrade. Hope that helps.
https://www.adark.co/collections/pr...eference-master-clock-audiophilestyle-edition