The Nagra streamer is likely a repackaged Playback Designs streamer. The Nagra is likely $5k and the PBD is maybe $3k. I owned the older PDB STREAM-IF and it was an excellent streamer. I sold it to someone who owned the $25k PBD Dream DAC. Do some research on the 50k Nagra DAC and PBD.
The STREAM-IF was as good as the Sonore OpticalRendu streamer and the Lumin X1. I owned all 3 at the same time.
One of my 3 Sonore Optical Rendu's died today. It lasted for a very long time. When 1 more OpticalRendu dies I will buy the Lumin U2 Streamer.