yes it's amazing, it forms part of the decision making algorithm. it's not 100% accurate here, manchester, sometimes it's under and sometimes its over. so had to compensate with other weather api's, which gives a more accurate reading for our location.
it just allows you to utilise the off peak tariff more effectively. off peak tariff on its own just doesnt work out for us. but with an EV and solar panels, and battery ESS = massive savings each day. and effortless when it's all tied together/joined up with software APIs.
we do use a lot of electricity here. only the boiler is Gas. so we dont cook with gas. and during summer we use the immersion heater for warming the cylinder. (because we have solar, it's cheaper than gas.)