Well well well if that's first impressions then it's a new benchmark for DAP first impressions
It reminds me of
@Deezel177 "first impressions" on flagship IEMs and that's not small praise... yeah those pics are gorgeous as well and it has my mouth water really
On top of things, those impressions come at the right time where I was feeling buyer's remorse (I stretched myself quite a bit there), and also cheer me up during a personally very tough time personally...
RS8 looks like it's going to be right down my alley, I recognize the minor nagging stuff I had with RS6 and R8 and it's good that you raise that up too.
The part about class A - Class AB being hard to differentiate on RS8 has me thinking of my own experience with N8ii where you really have to deep focus on certain aspects with the right IEMs and headphones to really hear the difference (whereas Tube vs SS mode or P/P+ is quite obvious). Your experience of R8 Turbo mode matches my own, and the fact RS8 fares better without Turbo means I'd need it only for highly demanding headphones or maybe IEMs like the Ely (?) which is good because it impacted R8 battery life very much.
On RS6 I kept NOS mode always on for the same reason you do, and I do the same on my Pegasus DAC too but I suspect spending more time with OS mode could reap some benefits in some pairings. We'll see.
I am a big sucker for vocals and I regret selling RS6 for this reason, I expected that it would be event greater on RS8 so that's great to hear especially if upper midrange is less forward than RS6 which was one of the minor gripes I had with it.
Layering was something I loved with R8 and I have been looking for since, so that and expansive holographic qualities has me mouth watering indeed...
Now the wait begins.... and buyer's remorse is gone, this is going a nice 50th birthday present
Again I think 256GB onboard memory is going to be so great for syncing and overall streaming apps speed with a smartphone like experience, fond memories of Shanling M9 there and something I didn't expect I'd want then.