I went kamikaze and installed Big Sur - and so far everything is fine

[PYP]

I never update immediately, but after checking that Roon would work I did just that.  No issues (have a simpler setup than many on this thread).  Response time to open apps and the like seems faster to me.  I assumed that there would be more overhead for Safari (assumed tighter privacy settings), but it actually seems more responsive.  Previous upgrades seemed to slow the iMac (2017) for a time (and then operated as usual), but not this upgrade -- immediate improvement.  

 

Given all the new music that Qobuz offers, haven't tried ripping via dBpoweramp.  

 

The cosmetic differences don't seem large to me.  Perhaps some of the fonts in certain places are even smaller.  Young folk must design this stuff.  :)