I have heard the Kleos on an Aries 3 and it sounded magnificent. I run a Helikon or a Delos on my Aries 2, having done so for years now, and, after trying Koetsu, van den Hull, Benz Micro and Shelters on this rig, would not even consider changing cartridge manufacturers; the match up between Lyras and VPI's unipivot arms is superb.