It looks great and better construction than the original Kadet or Kadet 2..
These are like the Sport III (from Kadet pistol) made for a German company named Waffen-Oschatz with 6" barrel and improved frame and fire mechanism. Grip looks awesome..!!!! 

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Waffen Oschatz makes very nice Custom CZ Pistols. But you have to wait nearly up to a year to get them.
A former member of my gun club has the full package in 9mm with 5" and 6" conversion kits.
As it seems, he takes the regular Kadet conversion kit and builds a new slide around it with a longer barrel
As far as I know, the Sport III is also available as a conversion kit only.
http://www.waffen-oschatz.de/cz-wechselsysteme/The grips are Nill grips. Very popular here in germany.
https://www.nill-griffe.com/Great competition grips. Had one on my 1911 at one time. But they are just to big for my small hands.
No idea, if Nill exports to the US though.