When I was looking for an integrated I auditioned the 866 and Pass int250 side by side. I liked both but I found the 866 more accurate and neutral, Pass was to my ears more colored.
When The Tracking Angle reviewed the 260.8 monos they did not find the bass quality to be at the same level as the Diablo 333, which they compared them to, and that the 260s were a bit too polite, fwiw.