I received my Stellar Phono Preamplifier last Friday and hooked it up over the weekend. The other components of consequence in my systems are a SOTA Sapphire turntable, a Premier FT-3 arm, a Hana SL low output cartridge, MIT phono cable, and Wireworld Eclipse interconnect cable (to my Theta Casablanca IV preamp/processor).
Early Sunday evening, I invited my wife to listen. To make it more interesting, I chose a selection of music that was also available for streaming from Tidal HD to my Roon Nucleus+ and Lumin T2 streamer/DAC, with the Lumin connected to my Casablanca IV via Kimber Kable Silver Streak cables.
After about 45 minutes of A/B comparisons, my wife turned to me and said we needed to get a better music streamer/DAC. I had to agree. My digital setup is really quite good, but the addition of the PS Audio Stellar phono preamp to my vinyl playback sub-system was even better.
Bottom line: recommended, but with two caveats. First, to take advantage of the preamp's capabilities, it is likely wise to have a good turntable, cartridge, and phono cable and interconnect cable. Second, while this phono preamp is quite good (and one can even say a bargain at its price), it is not cheap nor are the other components needed.