I spent a lot of time comparing the PC+Fidelizer with the Aurender S10 and could not tell the difference. For this reason I returned the Aurender S10 today. This means my system will be on of these:

PC running Tidal -> USB cable -> Playback Designs MPS-5 -> Interconnects -> VTL 300 Monoblocks -> Speaker Cable -> Dali Epicon 8 speakers

PC running foobar2000 or MediaMonkey -> USB cable -> Playback Designs MPS-5 -> Interconnects -> VTL 300 Monoblocks -> Speaker Cable -> Dali Epicon 8 speakers

I am very happy with the sound of both systems above. Fidelizer saved me a lot of money I would have spent on the Aurender if I did not have it. (The Aurender sounded better than the PC with no Fidelizer).