@gavin1977 First impressions of PS Audio DS...It's definitely a serious DAC. I'm feeding it via I2S from an EverSolo DMP-A8, then the signal goes to my Mac tube headphone amp via XLRs. The DMP-A8 is being fed from a M1 Mac Mini which is running my Roon core and nothing else.
It's been a while since I had the Yggy but I'm not quite ready to proclaim a favorite between the two. Unlike one of the other posters though, I do think they're worthy competitors of each other. My most recent DAC was an Octo 8 Stereo which, of course, is a Stereophile Class A DAC. I do prefer the PS Audio over that one already. I never thought it sounded quite as good in my system as the Yggy, but it was reasonably close. The PS Audio is definitely, as most others have found, a warm-sounding DAC. The detail is not quite there for me yet but I'm willing to give it time to settle.
Honestly, it's real competitor is the analog outputs of the DMP-A8. I hooked them to my amp just on a lark, assuming any of these stand-alone DACs would trounce it. I was wrong. It's shockingly good, at least in my system. I had planned to upgrade at some point to a HiFiRose RS130 which is obviously a streamer only, no analog outputs. I'm having second thoughts about the need to do that at this point.
So, though I'm not ready to proclaim the PSAudio as a DAC I'll definitely be keeping, I certainly don't regret the purchase. If the detail improves a bit over time I think that'll do it for me.