Zu is a lot like Busse, unapologetic and hardcore. They have done a lot of contracts for the Australian Government and aside from a few cases are made in Australia with Australian Cryodur A2. Most of their blades are 99% milled then hand sharpened, they are not as refined as Busse and in the full integral models usually have some milling marks in the blades, but nothing terrible, kind of along the lines of Guardian Tactical's blades if you are familiar with them. As their newer models have been released their finishing gets better every time. The newest generation of scaled models are much better with very few signs of milling. They are also offering different steels in the newer models, the Madkat is offered in 1084 & M2. The Nephilim I showed above is in 1084 as well.
I have tested and used the Cryodur pretty extensively and it's tough stuff, I have limited time with their other steels to see how they hold up but have no reason to think they would not perform to the expectations of the steel.
The Madkat is a pretty deep plunge to see if you like them. I can let you know my impressions once mine comes which may be this week. If you want to dip your toe in there's a
Shrapnel Dagger on the exchange now for a good price, I believe they were about $125 more from Empire when they landed. It's a cool little piece and very in line with Zu's roots.
Matt is a great guy and has a very loyal following with an active Facebook site. It's private but you can request access. I buy direct from him and usually save quite a bit with the exchange rate, plus we've gotten to know each other quite well over the years.
Good luck, they are addictive.