Okay, well then you don't need my report, but I'll give it anyway -- it's good. I wouldn't say it's as good as an external DAC/Amp, as I read elsewhere, but it's a good backup to my primary player. I prefer the Sony, but it's still better than any other phone I've used. Listened to Talk Talk's The Colour of Spring, Trio Italiano's rendition of Schurbert's 2nd piano trio, Kraftwerk's Computer World, and Porcupine Tree's The Sky Moved Sideways (all on Tidal hi-fi, downloaded for offline listening aka "cached"). It definitely benefited from the Pico Power, probably because I was using my Sony MDR-Z7, which are probably hard to drive.
But yeah, good choice, same one I would've -- and did -- made/make.