***FINAL RESOLUTION***
Well, my R 2500 R arrived a few days ago and is burning in.
My initial reaction is very positive, even using lower-grade cables until my new, longer cables arrive. The sonics are everything I was promised, and they're a great match for my Harbeths with no other components in the signal path.
When I use the R 2500 R to drive just the the FL & FR speakers in a 5.1 home theater, the increase in realism is jaw-dropping. Last night, I was almost knocked out of my seat when I sure that I heard a door slam in an adjacent room.
But the best thing about this incredibly well-designed box is its functionality. (I never thought I’d say something like that.) In addition to outstanding amp & preamp sections, it includes a 2023-designed dual PCM/DSD T+A DAC (similar to its $8000 model, I’m told), an integrated streamer with a very good Android interface, a TON of connectivity (including HDMI in & out), and even Internet radio / FM / DAB & a CD transport. And a lot more.
I’m finding the rest of my components to be functionally, not only sonically, limited in comparison. For example, my $2000 Marantz receiver can’t output digital and analog signals at the same time (which would let me, e.g., send a digital signal to the T+A and analog to my rear & center amps when watching something like 5.1 Netflix). The T+A doesn't seem to have such limitations.
I know that some people have negative knee-jerk reactions to integrated form factors (and I've posted at length about why those reactions sometimes don't make sense), but I spent months searching for an integrated that did not have the most commonly cited downsides. When the smoke cleared, only two or three made the cut. This new T+A model was clearly the best choice, as perfect a fit with my complicated topology as I could expect to find: beautifully conceived, designed, and built.
One last thing: A TENK YOU VEDDY MUCH shout-out to Juan from Bliss HiFi (he’s actually participated in this thread), who originally turned me on to the R 2500 R, and who has provided such outstanding pre-sales and post-sales support. I wish every dealer had Juan’s knowledge, experience, and customer-support skills. I can’t recommend Bliss too highly.