So I bought the Willsenton R-800i

@jbhiller First of all: Thank you so much for your elaborate description of the characteristics of the amp and its pairing with the Cornwalls. I´m lacking both language skills and ways to put into words in my own to properly describe what I´m hearing. What you write very much reflects my impressions. And I´m very happy to hear that the R-800i holds up well compared to other amps.

Most importantly though it´s good to hear that you are having a great time with it and that you find your money was well spent. Right now I´m away from home for almost two weeks and can confirm that this amp makes you want to come back and enjoy it. I can´t wait to listen to it again playing music I like.

Personally I find the volume jumps when using the remote totally ok, but that may be because with the Rotel I had before the jumps were even bigger. As an obect it feels a bit too clunky (metal, heavy, just three buttons), but then again I stopped counting how many times I lost the tiny remote for the Apple TV – something that never happened with this one.

I assume you have not started tube rolling yet, right? This can add yet another level of sound quality.

And another question: To me the sound becomes a bit (for lack of better words:) crowded once the music gets dense and more wild. Like when I play some rock music with crashing drums and lots of distorted guitars. Sure, it may be because of the recording, but the difference is striking. Maybe the amp is just too good at reproducing material where there is not too much going on soundwise (ambient, jazz, folk, etc.), I don´t know. Do you have the same experience? Or is that normal? If you know a rock record that also sounds nice when the action is on please let me know so I can compare. (But please no 1971 dutch first pressing or anything like that, when it comes to music buying I´m not that audiophile.)
Two examples that left me a bit underhelmed: Neurosis – „Times of Grace“ (not expecting too much hi-fi here, but usually engineer Steve Albini does a good job at capturing this kind of music) and Die Nerven – s/t.
On my Sony wh-1000xm4 headphones both sound punchy and allowing for dynamics even when the wall of guitars set in, on the stereo much less so.

@chmaiwald , Wow, I went back and listened to that Neurosis album. I wouldn't blame the amp for how this album sounds. The production seems intentionally nasty heavy. I don't listen to much metal or heavy punk though. Also, I'm in the minority camp on Steve Albini. I don't enjoy his production as much as others.  I always found it interesting that Nirvana held back their two radio hits on In Utero from Albini.  I think (sometimes) his engineering and production sound muddy and confused but that's just me.

I understand, I think, what you are saying about stuff sounding better when music is simpler (less going on). That's kind of a truism for all systems on some level. 

Do you use a subwoofer system?  The reason I ask is it can provide depth of soundstage and allow the highs to sounds more delineated and less harsh--just by filling out the lowest octave.  The CW IVs are not really a big bass speaker despite their size. 

correction--it may have been more than just two radio songs. I think Bob Ludwig may have remixed most of the album. 

@jbhiller I´m not using a subwoofer yet but I´m waiting for a reply from a dealer who is willing to send me two to compare (Rel T/7x and SVS PB 1000 Pro). The EQ I´m using is basically only to push the lows a bit. It also shows that the Cornwalls lack in that area (for my taste) but first and foremost it so much helps to give depth, just as you say. I´m hoping a sub will do that to an even bigger extent and that it will give the recordings I find (for lack of better words) crowded more room to breathe.

I like Albini´s productions for capturing a live feeling and directness which does not automatically translate into pure sonics as can be found on recordings considered good by audiophiles. You said muddy... Maybe I myself have to listen to it with open ears again, I´m such a fan.
Two years or so ago he recorded the newest album by SUNNO))), the drone-doom duo that basically plays guitar-generated soundwaves*. Compared to their other albums the resulting „Life Metal“ manages to leave room to breathe in the overall oppressing wall of sound. He´s done a stellar job there.

As for Nirvana: I find it hard to tell which mixes I like better, the re-mixed versions of „Heart Shaped Box“ and „All Apologies“ are just so familiar, those are the version I came to like. Albini´s are also great, the roughness and all. As far as I know it´s just these two that were fiddled with, the rest is all Albini.

@chmaiwald , I highly recommend REL's T line.  Very persuasive, musical subs.