Not 100% sure how he is using them with his Vandersteens (quatros) but tried both with my Harbeths. Both amps are very nice. But the flow of the music seemed to move along at a better pace with the Manleys. YMMV. His system also uses a Cary preamp. Mine is posted here. At the used prices i dont think you would have any trouble turning them if you tried both.