I can confirm it is noisy. High frequency noise is present. I measured with other sound card connected to same PC noises as 8, 16, 24, 32, 40 kHz frequency peaks about 25 dB higher than general noise floor. Maybe noises are from noisy PC USB supply but any way it is not good if supply noises pass to analog output.
Also Windows driver had some problems, I had get 2 times problem when connecting Gigaport eX to PC after PC was running, its volume goes to maximum possible, not following volume setting defined before disconnection or volume settings seen on Gigaport volume control panel.