I am a big fan of FTA Callisto usb cable which I use for over 1 year , unpowered version, bought sh from Goran ( Golum).
It is a fantastic cable with very dark backround and palpable presentation , I would say on slightly warmer side.
Two month ago a young Polish engineer asked me to try his usb cable in my system.
I did not expect too much but the reality surpassed largely my expectations. In my system is even more precise , with even better than Callisto 3 D soundstage and quiter backround.
Very neutral timbre.
I decided to get one, the price for unpowered version is around 400 euro in Poland.
Will keep both - Callisto and Audio Phase usb, this is the name of Polish small company.
I have no commercial interest in Audio Phase, just to be clear.