Simply don't understand the hype about this. I can turn my heat up and down using the thermostat; I can turn my lights on and off with the switch; I can run my bath by turning the tap with my hand. Why spend hundreds of pounds for gadgets to connect them all to a phone or iPad, which uses electricity to be charged up? If your energy efficiency improves drastically after installing this stuff, doesn't that just suggest you were previously over-heating your house and leaving lights and gadgets switched on all the time - simple things to notice and rectify?
I just cut my electricity bill by £100 over the year by switching supplier. Much simpler way of making a saving, and doesn't involve spending £150+ up front beforehand.