To be fair, I found some network switch mods or audiophile built products making mediocre or subtle improvements over stock one too. I think it also depend on which network switch you try and with what device and application you play with.
If designer has good reference ears and can tell good quality from listening rather than just specsheet alone, he usually build something he can truly enjoy with his standards.
For those who never have any real experience before, they shouldn't assume too much. I'm also challenging network experts here in Thailand for testing switch in multimedia. Hopefully someone will join up.
Regards,
Keetakawee