Anyone listen to Zu Audio's Definition Mk3?

I am following this thread with interest because I am also thinking about upgrading to the Definition Mk. IV. In this context I was astonished to read Danny Kaey's review in Positive Feedback of the excellent DarTZeel amp with more than 200 watts which he ran successfully on his Def. IV speakers. On paper this seems like overkill or even a mismatch? Can someone perhaps shed some light on this?

Thank you, 213Cobra. That puts it nicely into perspective.

I would be interested in how well the Def. IV comes alive on lower spl levels and how well its resolution is overall as compared to more conventional speakers. Can you shed some light on this please?

Thank you, Spirit, that helps. I currently have the Soul Superfly with the new Nano drivers and they need to be cranked up quite a bit before coming alive, and I also feel that flea powered SET's would not be the best option for the Soul. I don't quite understand the technical reason for the dfference to the Def. IV's which you describe but it is certainly good to hear.