I think the SuperUniti shared a DAC chip with other naim models of the time.
It’s really not bad at all.
Obviously DSP is a different chipset to later/improved naim implementation of the 1791.
CD might improve on Tidal I can’t recall. The streaming side of SU was improved upon when we moved to 272 then improved again by NDX2. Tech moves on!
I don’t think you’ll be disappointed with a decent transport.