This is going to get ugly.
Paraphrasing James - its pointless to tell someone what they hear and what the don't.
I find in order to hear differences in cables, you have to really know the system. I can detect changes relatively quickly. I'm not saying those differences are big, they're always positive or negative, and not am I saying they're worth the cost.
In a demo room, I honestly don't think I've heard differences. In my room, I generally have. What may be so subtle that a person unfamiliar with the system will miss, I'll hear in mine pretty quickly as I've been listening to it for the last couple of years.
I do not have superior hearing. I'm not a self proclaimed golden eared audiophile. Not even close. I'm just saying that subtleties in a system you've owned for quite a while are far bigger than in a system you've only heard for a few minutes.
I take cables home, listen to them for a week or two, then swap the old ones back in. If there's an appreciably positive difference that's worth the cost, they stay. If not, they go back. There have been instances where I heard zero differences, and instances where what should have been an upgrade was easily a downgrade.
I use a Shunyata Diamondback Platinium on my B60 and a Venom on my Rega DAC. I easily hear the differences. I'm not saying the stock cables were bad by any means, just that the Shunyatas were easily worth the $125 and $100 respectively. I'm sure someone else may think they're a downgrade somehow.