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We’ve had our Vaillant (and v-smart) in for 6 months now and it works brilliantly. The app looks shit but works well and the learning and weather stuff seems to just work too.
@Howard whatever you get, make sure it can control the modulation of the boiler, otherwise you’ll never get any of the efficiency benefits of a new boiler (especially in a larger house where heating momentum? is greater) and possibly wear things out quicker, slamming it on and off at 100%.
For those with Vaillant boilers, check out V-Smart. This is Vaillant's own system and connects to the E-bus system and offers fine-grained control of the whole system via the app, and learns as it goes. It uses internet weather info for weather compensation.
Our system has been in 3 years and I have no complaints. The app is fairly easy to use, and should bad things happen to the wifi you can still change the temperature with the thermostat buttons.