Anyone listen to Zu Audio's Definition Mk3?

Fred,
The Sistrum's were purchased after the Def 4's so no experience with them and previous models. Chalresidad has a good descriptionof the Sistrum efects and I concur with his statements. The difference is anything but subtle. I haven't noticed any significant tonal balance shift with the Sistrums...Quite an improvement in my system.
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Schw06, how about some system pics homebrew? That would help people visualize this....

As you wish Andrew. I've posted photos of my system for everyone that is concerned about the stability of the Definitions on the Sistrum SP-101's. When you see the photos, it's much easier to understand why it is a very stable platform.

SchwO6, how (by yourself?) did you position your Defs on these babies? You can't slide them once they are atop the SPs. This is some serious weight you have to hold while ,forget about just getting then to properly sit on the SPs, but how do you adjust (turn in out,forward/back) the speaker placement. I cannot imagine this not being done without a posse of three?

It's actually very easy. You place the coupling disc on the spikes and secure it to the sides of the spike with a piece of tape. Then, just give the Defs a bear hug and set them on the spikes with the discs. It's a remarkable stable platform. Once on the spikes with the discs, you can pivot them with ease to change toe in. It's actually a lot easier than trying to adjust the toe in with the 4 spikes.