In practice my SUT experience was disappointing. I used highly regarded Cinemag transformers with my Lyra Delos cartridge perfectly matched. The sound was energetic and loud but the treble was edgy and grainy.
Using my Sutherland 20/20 fully active without the SUT sounded much better.
SUTS are something you add if you do not want to purchase a good active phono preamp. My experience.