It's been long proven that electrical interference can happen in ethernet in certain cases. While the data may be ones and zeroes, it's carried by an electrical signal and the cables are subject in interference from other devices and power cables. Attach to the device at point of use, not at the source (router). High quality well shielded cables reduce but not eliminate the issue, and for many, the bundles of wires at the stereo can be a huge source of interference. That said, I would not buy one unless I had a proven issue that could not be resolved with proper cable management first.