BROKEN. This is a viable repair project for anyone up for it.
The issues:
-Right ear has crackly audio - a loose connection I think - but the sound cancelling still works
-Battery capacity is very low after years of use
-Wired connection port is bent slightly - still works but maybe not for long
However I recently replaced ear pads (third party)
BROKEN Bose QC35 headphones (BS1)
This offer has been gifted to someone and is no longer available.