Just a little update. The basic Zu 103 in my opinion is a bit of a giant killer, with tone and dynamics right up there with the best MCs, just lacking in a little detail retrieval and soundstaging.
The ESCCo mods have taken all what's best, tamed the stridency apparent in the top end with a fair number of discs, and replaced it with a lush sweetness that really complements the unbeatable tonality already present. However the first few days' listening revealed a little undue softness or lack of urgency in the sound.
Now, a few days burning in has resulted in an elimination of this softness and I'm getting a much needed dose of incision.
So I'm now getting a cart with real involvment, tone, excellent but not spotlit detail retrieval, and a perfect balance of sharpness and warmth.
In direct comparison with my 4x pricier previous fave, the Transfiguration Orpheus, there's just no contest - in no area now does the ESCCo Zu 103 fall behind. In fact it trumps it pretty comprehensively.