Great to hear that fibre optics has made it's way to USB. Done right, it can sound great. I'm using Supra Zac Toslink from my TV and OPPO Blu Ray player to my Technics SU-G700M2 and it sounds really good and betters the few coax cables I have lying around. In fact, I stopped looking for a better coax. They're that good.
All the best,