Well, my Kassandra along with the new USB cable already have 250 hours.
I have no ability to do a review like professional writers and some forum members who do it very well.
If I had to choose the characteristic that I consider better, I would say that it is the "naturalness" in the sound, understood by this as the opposite of the typical digital sound. If I make a comparison with my lumin A1 (it's very easy because it's still installed in my Rack), I can see that it is more dynamic, the image is wider and higher, gives me more microdetails..... all yes, but not the night and the day (and this confirms how good the Lumin A1) , but where it cannot compete is in what I call "naturalness", in the clarity that plays an orchestral "Tutti" and in the purity of the timbres of the unamplified instruments. There's just a day and a night.
It is not cheap (although with the prices we see today.....) but I think it's worth the money I paid for it.