Summary: The bad things : To start with, the size is huge, you'll tend to knock on anything as you move around in a small room. 1] The jack won't fit into your iPhone 4 series, not sure about anything above 4. 2] It produces a hissing sound when you're not playing any music.
Summary: what a relief to have my own clear source of audio, at my preferred volume. My wife also has her own set. They do of course work from the same transmitter plugged into the TV, The second transmitter is plugged into the hi fi and runs on the second wireless channel.