I did a lot of looking at all the various systems over the past couple of years and went for Tado at the start of October. DIY fit – took just over 1 hr and most of that is making a note of which wires go where and registering the devices on-line. They simply fit on the back plates of my existing thermostat and programmer/timer. No drilling, fixing, wiring required. Take old one off, put new one on. Done.
Remote control, and also when out of the house. Uses weather forecast to put less energy in if it expected to be warm/sunny soon. And it claims to learn the thermal characteristics of your house so will put more or less time in to getting up to temp.
Has been very useful so far, usually when cold we crank the heat up, but then it overshoots and gets too hot even after turning off. With Tado we can set it to ‘boost’ for 30 mins to just take the edge off when we get home.
Comparing on-line usage for October (first full month) we were 12% down on last year, and Oct 2015 was reportedly milder than this Oct. So it should pay for itself fairly soon.