I preferred Vitus SM102 to Kondo Kagura on Magico S5s at Rhapsody. But your Zus are so much more higher efficiency. Some will consider the Ongaku sound beautiful, pretty. I find it colored. Personally never liked Kondo. Like Vitus. Like many valves, not Kondo. But Kondo fans like nothing more. If you don't know the two sounds, would suggest you buy the best deal w.r.t the used market.