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Think almost all the systems now offer geofencing, either natively or via a third-party app - probably the best thing for a random schedule. You can set it up to start warming up when you are X miles from home; think some are more advanced, learning how long it will take to get up to your prescribed temperature, taking into account the weather forecast (or even taking a reading from your personal weather station, if you have one). Many also integrate with IFTTT so you can create recipes which account for anomilies in your schedule. Like most tech you can take it to the Nth degree!
Timmy2wheels-
Hive geo fencing is currently arrive home/leave so is a bit weak to rely on for random schedules. The web and app interfaces are good for managing random schedules, mine is randomish but by Friday afternoon I generally know what the following week will be so I can go on t'internet and set it really easily.
Ramsaye
I'm after the same sort of thing. I think 2 zones.
But ours is a completely new heating install, so do you think there's a reason to go for a different option as it doesn't need to integrate with anything existing?
Also our schedule is so random that I'm not sure what the learning side of it would do for us.