The UcDs were DIY amps that I build over 10 yrs ago. Ncore via Teac, NAD, and Cambridge designs. Purifi via Mivera.
I have always found that the source content really defined the listening experience. Garbage in...garbage out.
Never listened to vinyl and relied on CDs before streaming. Had high end Levinson transports, class A amps. Doesn't compare to streaming native content that I'm experiencing now.
I have to say that my old UcD 700 monoblocks sound really good through my Roon core and streaming via Qobuz. The Purifi's are a good step above and my current reference. The Class D GaN 5 gives me another level of definition. I can't really describe it (and not going to throw out all the reviewers terms). It just has me saying, I've listened to this song 1000 times and wow, it really sounds so much better. If I had to use one word....layering. Not 3D, but something special.
Looking forward to the Peachtree stuff and will also be trying the Rose RA180 when it hits the US.