I swore off solid state amps (it would be fun to ABX someday and see if solid state could fool me) though, I, I I am a believer that, in general, it is about execution and not about materials or topolology!)... But I had a great experience with subs and esl-63s because I lucked out and found subs that are fast and have pretty brilliant xover approach.
Someday I may go back to quads... They do things few speakers do in the treble region, in my view. Peter Walker was a genius, and Peter Snell too. I should lobby to have my first grandson named Peter.
Did your listening test with Peter include tube amps, or was that the time period when tube amps were out of Vogue?