These are new, as I did not previously own Nagra HD Amps or the HD Pre.
The extremely low noise floor was a big plus, as I was never quite happy with the noise floor from the DarTZeel 18NS/108 — but this is only an issue with ultra efficient speakers (mine are over 100dB), and if you are sitting within 3m.
I have the Classic Amp, Tube DAC, and the HD DAC X and HD Phono, and at this point I have come to trust Nagra, so an audition was not necessary. I’m not big on auditioning unless it’s in my room anyway.