I have heard them numerous times at shows and in a couple showrooms. At their best, they sound VERY good. The best that I heard them sound was in quite large rooms, rooms that were closer to small auditorium than even a large living room. Also, they really sound their best at somewhat high volume and are not as lively and dynamic sounding when playing softly. The depth of image, sense of envelopment and the ability to sit off axis and still get a good image is really topnotch with these speakers; they are not quite as good at doing the extremely distinct and sharp center image.
There is a touch of the hard, almost mechanical sounding edge to the initial attack of notes; whether this is a characteristic of the speaker or of the amps, it is hard to say, but in any case, characteristic is common to most high-powered tube and solid state amps. In a lot of rooms, the bass was a bit overwhelming and that probably accounts for why the bass also sound a bit disconnected or slow. Overall, a fantastic speaker if you like your music loud.