I have a bonded leather chair and it does get wear marks on the seams on one side. About once a year I patch it with vynil/ leather crack filler.

Honestly this is not BiFL but very fair service for less than half the cost of the typical chair recommended here.

Yes SC and HM are best in class. No argument. But my chair is not garbage one year later or even five of daily use. Not even close.

And that brings me to another point. Good maintenance is often as or more important than good quality.