Attached is a copy of the new review of Diamond USB in the March 2012 issue of “The Absolute Sound” as written by Editor Robert Harley. While Diamond USB (and all Diamond cables for that matter) is awesome, the beauty of Audioquest is the ability to experience similar performance with a $29 product (0.75m Forest USB).
A really easy shared evaluation/cable demo is to have a Forest USB cable along with the standard white Apple cable. Using the your iPhone/iPod/iPad device and music along with a current receiver with front panel USB input, play 60 seconds or less of a song with the white cable and then switch to Forest, play the song segment again and then switch back to the white cable. In less than 5 minutes, you have experienced (using your source and music no less!) that cables make a difference and that it doesn’t cost a lot of money.