Tried some used reconditioned Fidue A73s, they were good bit bright in the upper mids and had some sibilance issues with words with S on the end of it in songs.
Tried swapping out some tips to silicon to comfy memory foam ones and got some improvements and disadvantages too but overall they were not for myself
my existing soundmagic e10s were pretty much the same in SQ and much better sound isolation even with the same tips used.
When you buy ear and headphones I think its a great idea if you can buy used ones or ones you can return if your not happy.