I haven't heard the Spendor D9s, but I would expect them to be glorious. I have, however, heard the PSB T3s. They are a wonderful speaker and worth every penny. I heard them with a Primaluna Dialogue integrated with stock tubes (so not much wattage, likely 35 watts). I still have a memory of hearing certain guitar response motifs hang in the air. I wish I could compare them with the Spendor product.
There are seemingly no brick and mortar Spendor stores in the Chicago area. I would jump at the chance to hear them if I could.