Bought this usb isolator - long delivery time and then it did not work. Was shipped from China and had to pay import TAX and handling expenses. Found that it only supply 200mA which is nowhere close to the 500mA USB normally deliver. Took it apart and the quality is poor with the loose wire soldering. Cannot recommend this. I have also bought the sabre which was better quality.
My experience with this isolator is very, very good. I ear much better the higher end of the spectrum, more details and more sepation, better soundstage... the expanse is very justified...
The HiFime USB isolator successfully filtered the noise from my laptop's power supply. I can now charge my laptop while using it feed a UBS DAC. Makes both my laptops dead quiet. Just plug the Isolator in front of your USB DAC so the Isolator can clean up the power first.