I have a PSA PerfectWave Mk-II and tried the PSA DirectStream. The PerfectWave beat that hands down. Then I tried a Yggy. Even with no break-in time, it was better than the PSA units. I've had it now for a month and, finally, the bass is catching up with the rest mids & treble. Up to 3 weeks in, the bass sounds a bit shy, but is now well integrated.
I have to say, I've never heard the resolution of leading edge transients of all types as I can now with the Yggy. The quality of brushed cymbals, stringed instruments, piano, drums, and brass (glorious) are immediately obvious.
Just my two cents from a very happy camper.