I did listen to several - expensive - Koetsus, but not to Coralstone, UNIverse or Olympos I bought. To be honest, they are different from sound and they work better in some arm than in others, specially Koetsu or Olympos.
Independent from your units you use, the UNIverse works best with nearly everything I tried. Very good sound, good color, one of the real good ones. really easy to go and no risk when you buy it from someone and you did not hear it before.
The Olympos is for me a special chapter. It is rare and I listened to it in different, but expensive set ups and was not impressed at all. Then I got one from a friend and all who did listen to it in my System, were very impressed. It gives the reproduction a kind of life which is very rare with modern cartridges. But it requires some work (at least for my Standard).
It moves a lot of energy into the Arm, the better that one is, the more details you will hear. My choice for it is FR-64s/66s or from the modern ones, the Phantom II. But I think, a SME V can be a interesting match, too. Arms with weak bearing should be avoided (they make the sound harsh/analytical and the high frequencies are sharp). When you read a "description like "the warmth from a Koetsu but linked with the analytic details from a Lyra": forget it, not true. I mean, not really true. The Olympos has some abilities which are very remarkable, but it is like a journey. It refelcts what you have.
All Koetsus I did use or listened to, give a better Performance in a heavy Arm which has precise tough Bearing. Lots of pics show Koetsus with Triplanar, for sure most owners like it, but I found better solutions (for me).
Good luck
Independent from your units you use, the UNIverse works best with nearly everything I tried. Very good sound, good color, one of the real good ones. really easy to go and no risk when you buy it from someone and you did not hear it before.
The Olympos is for me a special chapter. It is rare and I listened to it in different, but expensive set ups and was not impressed at all. Then I got one from a friend and all who did listen to it in my System, were very impressed. It gives the reproduction a kind of life which is very rare with modern cartridges. But it requires some work (at least for my Standard).
It moves a lot of energy into the Arm, the better that one is, the more details you will hear. My choice for it is FR-64s/66s or from the modern ones, the Phantom II. But I think, a SME V can be a interesting match, too. Arms with weak bearing should be avoided (they make the sound harsh/analytical and the high frequencies are sharp). When you read a "description like "the warmth from a Koetsu but linked with the analytic details from a Lyra": forget it, not true. I mean, not really true. The Olympos has some abilities which are very remarkable, but it is like a journey. It refelcts what you have.
All Koetsus I did use or listened to, give a better Performance in a heavy Arm which has precise tough Bearing. Lots of pics show Koetsus with Triplanar, for sure most owners like it, but I found better solutions (for me).
Good luck