I heard these at Munich and thought absolutely stunning.
I had extensive home demo of the top-of-the-line SR6, and loved the treble and mids, but felt the bass lacked impact and so decided they weren't for me. The R8 solve this - they maintain the beautiful upper range from the ribbon tweeter but match it with deep, powerful, and impactful bass. If I were looking for a speaker in this price-range, it would be right at the top of my list.