Most people see the tubes and say, "cool, look at those relics!", as they lean over to touch them. Discouraged quickly by my growl and Sicilian "evil eye". Nearly all are uninterested in listening to my system. And the handful I can get to sit still for a few minutes can't seem to still their mouths long enough to hear to what they are listening. But a few extremely rare comments have been made.
Best compliment? It is a tie.
Upon first listen to my first ever highish end system, playing Pavarotti, my wife and I just stared at each other, dumbfounded, mouthing, "Oh My God!"
Friend/Coworker who sings, records, and conducts a large choir in the Atlanta area stopped by to give a listen. We played material he recorded and said (not exactly, but to my best recollection), "That's it! Exactly how it was recorded! I've never heard it played back on any system which did not compress the complex vocal passages, until now."