I've put 24K kilometers on one of the early cylinder sets.
They had some visual and mechanical issues, but they have worked out very well!!
I'm not into museum show quality anyway.. I want something that works (nearly) regardless of where I'm riding.
I got a spare set later (2years ago) and this set didn't have the issues as the early set..
The cylinders still had the hone marks visible after 24K, and no noticable wear apart from the standard valve seat adjustments. The cylinders have very good metallurgy..harder than original and previous repro cylinders. But.. keeping consistent quality is maybe an issue with the bargain price parts (I pay $400 for a set).
I'm installing new totalseal rings now which I believe are slightly harder and off course seals better.. I hope this will last a long(er) time before piston blowby becomes a problem. I switched to soft mahle rings some years back, after several reported problems of hard rings and soft repro cylinders. But now I have much harder cylinder walls to cope with harder rings..
As long as it works for me in real life.. I don't care too much about theory...