I just spotted where you and Lee Harvey were asking about this very same question on CA, where a few of the guys have reported liking both, as well as the Aqvox ( which were in fact on my list as well ) and even a couple of guys whom like the Pangea Silver USB which Lee Harvey presently owns............., so I'm hoping to see what he says?.
Yet I do agree with the one guys statement about the USB cable coming from the iFi or Regen, as well as the one going into the DAC from either is just as vital, as I'm using an 0.7m Supra in said location off the Regen into the iDSD DAC and loving it as opposed to the hard adapter.
Maybe in the new year the Curious Cable shall be obtained after all. As I've heard USB cables upwards of $1.200 which I believed couldn't even touch the Vertere Acoustic D-Fi V2, not along the Supra which to my ears has a very very very well balanced presentation that ones again has a nice sense of musical flow going on with it, once one gets pass the desire for something that offers a more detailed HiFi type sound and wants to have the notes actually wash over their spirit in a very natural and uncolored way as heard via this olde dogs ears.
To date I've to say the very best USB cable that has entered my system was the CAD ( $500|1m ) which offers a sound that many would die for.............., but it's not going to suit everyone's taste, nor budget in much the same way the Supra is capable of drawing you into the music.........., as opposed to sound, I've sold 17 of my friends on it since last week, with 14 of them reporting back to me that they loves it's presentation as well, so let's then see what the other 3 have to say?, including Lee Harvey.
Yet regardless of said findings, like both the Regen | iUSB 3.0 mine is here to stay.............., while a few might be added........., it's not going anywhere, and you've my word on that one, 4 'Sho.