I just got my prize from the give-away today, and it is very nice. To get it to play nice with my LH Labs Geek Out V2, I had to engage the 'on' switch. The Geek Out V2 is a very nice transparent DAC with well regarded dynamic range. I own a LH Labs Lightspeed 2 cable that has split power and data and I tried the DAC straight out of the computer using the Lightspeed 2 and from the iUSB3.0.
The iUSB3.0 increases both soundstage depth and width. Instrument separation is also improved. I think the improvements are due to the blackening of the background through lowering the noisefloor. What I noticed most is bass notes sounded fuller, and plucks on instruments and bangs on drums more distinct. It was like a subtle veil that I had never noticed before was lifted.
I'll be taking this bad-boy brick of audio awesome to a mini-meet this Friday. I'll try to take notes and get impressions from a number of folks. Expect pictures then too. This think will be mated with a Schiit Ygdrassil, a LH Labs Pulse X-Infinity, and a DiDiT DAC 212, all £2k plus DACs. It will be very nice to see what this little wonder does with the big boy toys. Watch this space, I'll be posting a link.