It appears 2juki has been a good reputable seller according to what I have read about him in the past.
But, I think the only downside of buying a ZYX from him, is no factory warrantee.
Don't quote me on this, but I imagine it stands to reason, buying such from an overseas seller.
Any possibility of an out of the box issue? I strongly doubt it. Usually, 99% of problems are "user induced". I imagine he will still stand behind a manufacturing issue, but it means of course sending it back overseas, and awaiting a determination.
I own the Airy 3X SB, and Mr. Pig bought his 4D pretty much on my personal recommendation. I can assume he is more than thrilled with it. The Airy 3X is killer, and the 4D is claimed to be substantially better than the Airy 3.
It's hard to imagine, but that's what they say.
The Yatra and Fuji are as well very good I've heard.
I think the important key with any ZYX Cartridge is selecting the Low Output Version. And as well having the Silver Base Option.
At around 9gms of Cartridge Weight with Pure Silver Base, this then usually places it in the territory of working well with pretty much all medium mass Arms. Otherwise, one may need to add a Headshell Weight without the Silver Base.
All models in Low Output sound better than their High Output brothers. This of course places demands upon a Phono Stage, having the proper Gain, and Loading.
Most Low Output ZYX at 24mv (but actually more like 32-33mv due to the particular testing methods) usually require about 58-62db gain. And about 100 or 200 ohms loading. I have my Sutherland PhD Phono PreAmp set at 62db Gain and 100 Ohms Loading.
I also have on my Airy 3X Cartridge what is referred to as the "Zn" option, which means the Mounting Nuts are there already mounted on the Cartridge. This of course helps simplify installation.
Hope this helps,
Mark