I recently auditioned the 685s and thought they were truly awful on the end of both Marantz and Arcam electronics. Splashy treble, dead bass, and very little sense of integration and cogency to the sound. My Diamonds walked all over them in the dem room, as would the Mordaunt-Short MS914i floorstanders and my Dad's Tannoy F1 Customs. Spending that sort of money on speakers, I would strongly advise listening to the 685's competition (as well as the 685s of course).
Quite controversial I know, but its only my opinion and hi-fi is such a personal thing.