I installed the upgrade. No problems, no change, good or bad, in SQ. Between the 4 software platforms I have to contend with, HEOS , BluOS, Sonos and Amazon, it seems competitive, but none of them I would rate above 'fair', except Sonos, which struggles to reach 'poor'. That mis really too bad because I rather like their hardware for secondary TVs, e.g. Bedrooms. Amazon excels at voice control, which is great when searching for some more obscure titles. HeOS is more or less proprietary to Marantz and Denon, where it works OK.
For serious listeng though, I remain impressed with the whole BluSound platform.