Chord Qutest - would you buy it again?

No I wouldn’t . I had a qutest fed from  a lumin streamer via kimber coaxial digital cable. I was not happy with the sound even with  all the filters. I sold it and bought a theta digital gen viii series 3, which is a class a preamp plus dac. It sounds amazing. The step up over the qutest was like night and day . I also feed my ayre cx-5 CD player through it and redbook cds sound very nice. Would recommend the gen viii . 

If you go to RME ADI2 DAC walk through RME has made a 5 part step by step video on how to operate their DAC. Much easier than going through the book. Audio Science Review has a pretty active RME thread. Good place to ask questions.

@luxmancl38 Thank for the tips. The ADI-2 will arrive in a week

I have one.  I think so.  I would prefer it was MQA certified, although I doubt I could tell.  I "upgraded" from the Bluesound inode 2I.  But I upgraded amp, speakers, etc. 
This is my computer audio, so for the application being a computer driving a USB stream it works fine.  
With the tubes, the filters and everything else, it is very hard to AB them.  At the $1,800 - I believe some other may win for for sound, however the build quality is excellent, and that ranks very high for me.  So likely would do the same.  
The Watkins Gen Four speakers made the setup much more than anything else.  So I'd spend other places first if sound with budget (value) was the top priority, but with build quality and simplicity, it is worth the money.  
 

I have been listen to the RME ADI2 DAC for a couple of days comparing it with my Cambridge Audio Azure N851.

The ADI-2 has more air but voices could really need some warmth. Don't think I will keep it.