MZPRO5

I am not sure I would recommend the Duet for anyone who would be using the devices analog output (for example us RR2150 users). While it doesn't seem to be made anymore, the SB3/Classic has a better S/N ratio and better Digital to Analog chips.

There also seems to be cottage industry for upgrading that device.
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Living Room 24x18 open 1/2 flight up to a raised dining room/hall 24x12
Outlaw 976 pre-pro running 5.1 system
Outlaw 750 for Artison Masterpiece LCR and 2 NHT SuperZeros rears
Velodyne Servo FX-1200
LG OLED65C8PUA via HDMI2 to/from 976 HDMI ARC
Roku Ultra
Samsung BD-D5500 BluRay
Amazon FireStick 4K to 976 Aux HDMI input for Amazon Music Ultra