I finally broke down and chose the RS6 after 3 weeks of auditioning different speakers. I'm further impressed by them when I played them at home. The bass is tight and excellent, with quite a slam - the kind of bass you can feel when the music has it, even though I only played at moderate volume ~75 db. They replace my 14 yr old JBL that have a 10" woofer each. I'm amazed that a couple of 6" woofers on the RS6 can perform so well. This is quite an engineering accomplishment.
Now the midrange, it is very good. I can hear the words sung by the choir - crystal clear, like I hear them on the Sonus Faber floorstanders. Well I'm not saying that MA is equal to the Sonus Faber but that MA can perform well in this area. You see, I am not afraid to audition speakers I cannot afford but I regard the Sonus Faber as a sort of reference since I don't have real life performances to use as a reference. Well actually the Sonus Faber sound transparent but it's not a fair comparison since the Sonus were driven by Macintosh power amplifiers, while my humble MA are driven by a Denon receiver that costs $400. It is not that the MA is not transparent but that the Sonus sound more transparent but that's beyond many people's budget, or what many people are willing to spend for music reproduction.
Now in the high treble area, the MA sounds airy without sibilance, with the treble at -2 to compensate for the lack of "burn in" or "break in".
Overall the speakers sound smooth, crystal clear and neutral. As MA stated, they are "as close as it gets" (to real performance).