Had it nearly a year now, with Combi boiler and aircon. Apart from the gas level indicator (gaslow bottle), which can be a bit petulant, it all works well. I can check the battery voltage (etc) from anywhere and adjust the heating without getting out of bed, if it’s getting hot, it will send me a text to tell me and I can turn on the aircon remotely. Well worth it IMO.
Edit: old style Gaslow should work, the new float gauges confuse it.