Thoughts and experiences on the Spendor SP100 R2

Seeking input from knowledgeable folks who have had or heard the large Spendor SP100 R2 speakers, or their predecessors or successors. I have had smaller Spendor SP2/2’s in the past, really enjoy their excellent mature sound, nothing flashy but sounds very real and easy to listen to.  Currently have the Epos M22 three way floor standers driven by a Naim Nait XS2 integrated.  I know the Spendor S100 series of large-box 3 ways have been the top of line model for the ’classic’ line, which they have continued to manufacture since a long long way back.  I guess they have periodically updated the speaker.

I would appreciate input on these speakers (there is a very nice condition set I can purchase used from the owner locally) and how they might compare to larger Harbeths, ATCs, Grahams, Wharfedales, even Devores and Klipsch’s (in the $6000-10,000 per pair range).

Also any input on suitable amp power and type to drive these Spendors would also be of help.