I have tried and owned a lot of cables: Nordost, VDH, AQ, cheap Monster, high end Monster (Sigma Retro), DH Labs, PS Audio, StraightWire, and others.
Cables do transmit the musical information in a different way. For me, it's not necessary to spend a fortune in cables (after all, it's just a cable! I don't care if they are cryogenic or oven baked, it's still just cables, and I think it's crazy to pay thousands of dollars for them), but it is absolutely necessary to choose the right cable to suit your taste and make your system sound right for you. It's not that a right cable can make such a big improvement in sound. It's just that a
wrong cable can really make your system not enjoyable. So, in a sense, they are at the same time very important and not so important
. And the right cable can be a cheap one, that's for sure.
Cables are used to fine tune the system. You want extended HF and low noise fllor? You try a silver coated cable. You want a warm sound? you try a copper cable. You want speed and a lean balance? You try Nordost. You want bass? You try PS Audio. And so on.
But no cable is good for itself. They are just good in relation to the rest of the system. It's all about synergy.
IMHO.