I listened to Morbidtoaster's Harbeths (can't remember model, 8" woofers) powered by a Leben for several hours one night at his apartment. Far from ideal room, etc. They sounded alright, but the mids were sucked out, and I wouldn't have liked them for anything but pop/electronica, which was almost all of what we played.
I threw on a jazz piece and a vocal jazz piece and they collapsed. Not good at all. The bass from the little 8" drivers was impressive, subwoofer quantity bass. Lacked a little on bass control, but not as bad as you might think with the quantity vs driver size.