re rooms: I usually ignore these things but if you sat in the back of the Blink room, you could hear a large hollow echo on the demonstrators(owners?) voice when he spoke :Also, the ONKK room was lively with some reverb. Triangle and one or two others had some vocal distortion on the first day. Also, problems in the sound by singer room. The music played in the Harbeth room was so good that I didn't notice problems.
ohm,vanatoo ,voxativ,Pure and orinda had no obvious problems.
Rooms with stein dots were Harbeth, TA and laufer tek.