Inline WiFi Smart Switch

I have just stumbled across this brilliant little device on AutomatedHome:

http://www.automatedhome.co.uk/new-products/video-sonoff-wifi-smart-switch-for-alexa-mqtt-nest-control-for-under-10.html

I think I will have to order a couple and report back on them. I love the idea of not having to use a bulky power socket adaptor.