People stand on plug and force the turning mechanism plus the knob gets knocked about moving it.
I think that's why reviews aren't that good rather than poor quality.
I'd go for mcalpine or flomasta.
They are much, much less durable and reliable than the simple rubber plug on a chain. And much more effort to replace.
After years of disappointment with pop up wastes of various kinds, I now use Clackers if a removable plug is not desired. At least you can replace if it change the ring from above.
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