Anyone listen to Zu Audio's Definition Mk3?

I'm not going to rush into a cap change at this point, although it's on my radar. The sound of the 4s is changing daily, thankfully for the better, as I continue to make small adjustments. Eg I've just located my amps onto Symposium Isis supports, and having placed Precision Couplers under the amps a whole layer of upper midbass colouration has cleared and a more transparent window to the music has resulted.
I always scoffed at audiophiles talking this way, but, ahem, I'm now guilty of applying hyperbole to what I perceive to be big changes in sound with ongoing changes.
What I'm concluding from this is that the 4s really are a remarkable transducer, presenting a really direct line to the music, and capable of revealing the quality of all elements in the chain between it and the source played.
I want to try a few changes, but based on my conclusions so far I'm certain a cap change will be noticeable, as would amp change from SS to SET 845/OTL.
Phil, please keep us all informed on your cap change findings. Please give serious consideration to trying the Dueland Cast Cu, apparently the best, but also the most expensive. The guy on the 6Moons site with DruidVs certainly concluded it was an advantage to swap out the stock Mundorfs.

I've had some extensive conversations with Sean regarding caps for the Druid mk5 upgrade. Clarity Cap MR is his favourite value for money cap with the Radian, very close to Duelund in the mk5 configuration. I had Mundorf SIO caps in my network already........... He said change them.

Hi Phil,
I`ll be very interested in your upcoming capacitor comparisons.I`ve put Duelund CAST into my speakers last month(tweeter,only caps in the speaker). Phil in one simple word,stunning!Despite their higher cost relative to other WELL regarded caps,the CAST are on a different plane. The more transparent the speaker, the greater the effect.I`d pay 'twice' the cost of the CAST given my superb results in both my speaker and DAC .
Best Regards,

Phil,
I forgot to mention the Duelund CAST is quite large and space could be a limiting factor. On my system page there`s a picture of my stock cap(solen) next to my 5.6uF CAST.Duelund also makes a VSF model capacitor that`s less expensive(and smaller) but better than nearly all others except CAST.
Charles,

Charles, my UK Zu dealer concurs that Dueland CAST Cu capacitors on the tweeter are likely to be a fruitful avenue re upgrading the 4s to make the top end sweeter and more extended, and importantly, better suited to a wider variety of amps, be they SS, SET 845 or OTL.
Just waiting on Sean to inform of the capacitance value before possibly going ahead with the change.
I'm reasonably confident this may tame some of the glassiness apparent with my Hovland Radia SS power amp, obviating the need to go tubes only.
If it presents a level playing field and is more SS amp friendly, it'll be worth the price of admission.