I have been using Kawasaki links since 1983.
They are expensive! but they have nothing to do with anything else, German or Italian that I have tried.
Due to their high price, I made various tests with others and concluded that if you don't want to waste time and money, you should buy good products.
The first time after 5-6 years, it caused wear at the friction point of the link balls.
Then an old mechanic told me to lubricate the friction point with a little oil 1-2 times a month.
Since then I really have these components, many of which work without any problems, for more than 30 years!!!
WARNING
Stay away from cheap imitation Chinese products, I tried them and they are really unsuitable even for amateur use.