For years I have argued how the cheap HDMI cable was no different to an expensive version.
However, today at the Bristol show I purchase 3 Chord Active Silver cables and it totally blew me away. For bluray playback or fir anything where data is being read actively from a disc, there is a massive boost in sound quality, the sound was sharper, crisp and punchier. Picture was also warmer, deeper in colour and rich. I am still reeling from the shock, I fully expected there to be no difference and to a certain degree I was right... Using it with sky, no difference, PC, no difference. However, bluray yes, music yes and even gaming.
My wife walked in and said "the tv looks better and sounds better". She was unaware of the test I was conducting, so that was unbiased from a non audiophile/videophile.