I just picked up a pair of used Bel Canto REF1000m monos on Agon. Plugged them into my First Sound Presence Deluxe mk III pre amplifier with the most recent two 'S' upgrades performed by Mr. Emmanuel Go of First Sound here in Renton, WA. Both pieces (actually all 4 pieces given the pre amp has a separate power supply and there are two amps) sound remarkable. I've owned a number of amps and pre amps, solid state and tube, SET, push-pull, integrateds, by Cary, Electrocompaniet, DK Design, Parasound, Jungson, Precision Fidelity, EICO, Doge, and my current combo bests them all, to my ears. First experience with class D amps and I must say they don't take a back seat to anything I've owned or listened to.