I have both. Smart meters are useful for accurate (most of the time!) billing without having to send meter readings or have the meter reader call. So the linked bit is useful - the other side is that they have some sort of display to show your current usage. The problem(s) with ours are that the first generation display is way too bright, with a huge green light which illuminates the entire room - and it uses up a socket as it needs continuous power (partially defeating the object?). So we do not use the display at all. Later models have somewhat better displays. Tat said, I am not overly bothered about my current usage - it is fine to know that the kettle is drawing a lot of power, but I am not going to stop using the kettle because of it.
Secondly, it is not very smart. We had it installed by British Gas, but when we switched to EON they couldn't read it. Because we had a smart meter marker, we couldn't get the quarterly email notification to send readings so the reader had to call - you couldn't make it up! Now we are back on BG, they work as they did before.
As for the thermostat, we have Hive and it is very good. The remote control is useful, and although it sounds lazy, it is much easier to program the thermostat from your device, even from the same room, than it is to do it on the thermostat itself. Nest has other functions but is mains powered so needs to be near a socket. Hive is battery powered and can be anywhere - and can be unhooked and moved about the house if required.
Secondly, it is not very smart. We had it installed by British Gas, but when we switched to EON they couldn't read it. Because we had a smart meter marker, we couldn't get the quarterly email notification to send readings so the reader had to call - you couldn't make it up! Now we are back on BG, they work as they did before.
As for the thermostat, we have Hive and it is very good. The remote control is useful, and although it sounds lazy, it is much easier to program the thermostat from your device, even from the same room, than it is to do it on the thermostat itself. Nest has other functions but is mains powered so needs to be near a socket. Hive is battery powered and can be anywhere - and can be unhooked and moved about the house if required.