I've had a set of KZG ZOs around for years that I hardly ever played. My regular set was at the club, so when I played somewhere else yesterday I decided to take the KZGs....
Short answer - they are too much club for me. Couldn't find a sweet spot but on a few shots, and they never felt as smooth as my Wishons. I wasn't swinging that great, so take this with a grain of salt - but I was only one day removed from my Wishons and it was a noticeable difference.
They look great and I can see the appeal for some, but far too small an audience for these. You better be a plus handicap, and even then you may want something else.