Most of the comments on my system have come during dinner, when the music was playing in the background in the den just off the dining room. Usually it is someone asking what is the cd that was playing. When I tell them it is vinyl, they are always surprised. then they realize why I kept getting up every 20 minutes or so.
Other comments from the dinner table are "that sounds real" or "that sounds live" or "where is that music coming from" or "my cd doesnt sound like that".
I think the relaxation of the dinner table allows a new person to let the music into their subconscious differently than if you just plop them in front of the speakers and tell them to listen. In the latter case, they dont know what they are listening for, and it is an imposition. In the former, it sort of sneaks up on them, as they recognize the quality of what they are hearing.