Anyone listen to Zu Audio's Definition Mk3?

Thanks Phil. Actually, I've always found Zu products haven't required serious break-in, obviously several hours must be performed at the factory before they're delivered. This applies to the Zu Event phono cable I've bought recently: it sounded great out of the box, and has only improved a little in the intervening month of continual use.
When I bought my current Def2s in winter 2007, it was pretty cold, and it took a good month for the soundstage to widen as the drivers physically warmed to room temperature. Since I'm going to take ownership of the Def4s in the summer, temperature should be less of an issue.
Great to hear your Def4s sound so good so quickly, and continue to impress.

So has anyone actually heard the mk iii's? Some of us can't afford the mk IV's and we would love to hear any and all impressions or thoughts on this topic!

And btw, I noticed a very dramatic break in for the Omen Defs that I had previously. It took a good 300-400 hours for break in and then I noticed a gradual improvement for a good 6 months. This may be due to the fact that I listen at low volumes but I've heard the same from many other Zu owners.

Morganc
As I stated earlier my time spent with the 3's was brief but the difference between them is immediately noticed imo.
With your ear sensitivity I think you would really prefer the radian tweeter in the 4's. It's really smooth. If they are not affordable the news of new models incorporating the radian tweeter are on there way. Check out the 6moons initial commentary on the Druid V.

Thanks so much Bufford. That is a good read on 6Moons and I do think that the Radian tweeter will be worth the wait for me. Zu is doing a very good job of investing in new technology and then quickly trickling down that technology into the lower end models for us on tighter budgets! I bet the new Druids will be a huge success.

From what I gather on comments here, The Radian supertweeter is sweeter and more extended than the rather rough and ready unit in previous Definition models (like my 2s). I'm really hoping it's going to integrate well with the FRDs and ease my current lack of high frequency satisfaction.