I have been trying a variety of in-home demo's compliments of my local audio stores. Last night I brought home the new Monitor Audio RX6. I am glad I did, was getting ready to keep the Thiels and go with a Sub. Simply put, they weren't just a little better then the Thiels. They were a lot better. Highs were more refined and laid back, with more resolution and micro detail. They had none of the grittyness and fatigue I get from the Thiels. Midrange on the RX6 was more open and detailed, which was a surprise. I heard fretboards and fingers across strings and hands on bongo's I had never heard before on recordings I had listened to 100's of times on my Thiels. Bass was definitely more extended, tighter and more controled. I estimate the RX6 go down to 40HZ (literature says 38hz, probably at -5db) Thiels rolloff was 50hz according to old literature. Bass was substantial enough to omit the need for any subwoofer. They were also more effecient, easy to drive, and very forgiving when pushed.
FYI I have also listened to the following Totems (ARRO, Dreamcatcher, & Rainmaker, great detail and imaging, very lacking in what I call the slam factor, need a sub) B&W 684 (I don't get it, very neutral but boring, gave me no excitement, almost thin) Paradigm monitor 7( I have other paradigms for our surround sound in our family room, great for movies but present there own set of problems with music, especially the upper midrange)