HDMI cable differences

I currently have a Wireworld Ultraviolet 5II. Can someone explain to me what improvements i would gain from going to a Wireworld Silver Starlight 6 ? Is there any audible differences noticeable or is there just better video quality with the better cable? I have the opportunity to get the Silver Starlight for a decent price for a limited time so i just need to know if it will be worth the upgrade.

If nobody can give me first hand experiences i would appreciate being pointed in the right direction to find some more info. Thanks.