The voice-controlled home assistant works well, but on the other hand it is a networked listening device, with wider implicationsA few weeks ago, I bought Amazon’s latest gizmo – the Echo. It’s a voice-activated, networked device equipped with a seven-piece microphone array, which means that it can pick up one’s voice from anywhere in its vicinity with impressive accuracy. It comes in two versions, one a 9.25in-tall cylinder that contains a number of speakers, the other a much smaller cylinder that just has tinny speakers