I'm a geezer audiophile and I have experimented with cables for decades. So far I have never heard a cable that makes a difference. One possible reason for this is that I use a control whenever possible. For example, I have multiple digital components hooked up (two DACs, two CD players, two transports) and my method to test cables is to compare two components, let"s say two CD players, with my standard cables which come from Blue Jeans. I do my best to identify any differences (which are small when comparing digital sources in my experience) with the same cables and then I swap out the cables on one source. I will leave this arrangement in place for a month or two and compare the two sources a number of times using the same CD on both making sure the volume is the same.
I hadn't heard a difference on the cables I tried but I had read over and over that silver cables have a particular character. Some people love them and others not so much but they had a reputation for giving a distinctive sound. So I went ahead and spent several hundred dollars on a pair of Audioquest silver interconnects and did my test. Same result. Bupkis.
I think it's very enlightening that nobody has produced a controlled ABX test that shows that listeners can identify different cables when they don't know which they are listening to. If anyone on this thread knows of such a test please provide a link. It's particularly important that no cable manufacturer has produced such a test. If a company had a cable that could reliably be identified in blind testing they would be filling every audio magazine and every internet ad crowing about this information.
I realize that you asked for personal experience and I fully accept that if someone says they can hear a difference between cables then they hear a difference. All I can say is that I've saved thousands of dollars over the years that I have put into DACs, speakers, amplifiers, and especially recorded music.