Below is an old post from the late forum legend NC Hauler.
It was his posts back when that originally attracted me to Sailun tires.
As long as the tires are still being made to the manufacturing standards NC Hauler mentions I would not worry about Sailun quality.
If the tires are no longer being made to this standard it is time to be concerned.
Posted By: NC Hauler on 03/15/15 05:11pm
Only Chinese manufactured tire that I know of that meets same stringent ISO audits (TS 16949) that my company has to meet to compete in the world market and have a good reputation when it comes to manufacturing a Quality product....To attain this certification, they have to prove out and have records on all manufacturing and Quality processes involved in their manufacturing processes. All training records, management, finances, ESH, HR and on...So I too will look at these tires when time to replace my GY G614's due to the fact that they cost less but seem to be every bit as good as the GY G614's.