I am considering the Curious cable and have a great interest in your findings. Please keep posting as you get a good handle on its performance.
I should add, for those interested in buying these, Rob Woodland, the proprietor at Curious cables, provided excellent communication throughout the ordering and shipping process. The cables were shipped via AUS post with tracking and arrived 11 days after they were shipped. The came in a sturdy box (with a ribbon and bow) and a card seeking comments about my impression of the cables. Fit and finish is first rate, although the connectors are not the fancy ifi or Paul Pang type, but neither are the connectors on the Totaldac USB cable.
I ran them in all morning by playing Ayre's full glide tone track on repeat. They have not changed much sonically from my first impression - smooth, clear and full sounding, with a touch of darkness. I will not have too much to add until they burn in and I switch back to the other cables for comparison. Darko really likes them as you can read on DAR. If any of you have burned in a set, let us know what you think.
Not too much to add for now. Like everything else, the results are also dependent on the other gear being used. Right now my set-up is the Curious 0.8M cable from the Antipodes DX into the W4S Recovery, then the Curious Regen link (short USB) cable into my Metrum Pavane. With the SMc upgraded McCormack DNA-2 LAE amplifier this is the best-sounding combination. With my Acoustic Imagery Atsah 1200 monos, I think it sounds a little better if I substitute the Totaldac USB cable for the Curious cable. Regardless of the amp or USB cable, For now, I seem to like the W4S Recovery a touch better than the Regen.
As a gross generalization, the Curious USB cable seems more about body, fullness and weight while the Totaldac USB seems more about energy, clarity and tone. However, each of them provide all the listed characteristics, to some degree. I can certainly understand how those running computer (laptop or Mac mini) sources would like the Curious cables, which may overcome some edginess. IMO, both of the mentioned USB cables are good and like most of this stuff, there is no clear all-the-time "winner," at least in my system.