I added the heated seats to my MY17 Beach.... Love them..... I'm getting the cloth re-trimmed in leather today (of all days) and as this was always my intention, I added the heated seats option during purchase (I would have went for factory leather also, if it had of been available.)
I was strongly recommended to add the heated seats my a mate who has a conversion (without a parking heater) as at the end of the day a van takes longer to heat-up inside (parking heater mitigation aside) and heated seats give you that comfy feeling from the get-go. I park my Beach, which has the overnight heater, in my underground car-park, where it is out of range of the remote. Not that it gets terribly cold underground anyhow.
First thing I add to my motorcycles is heated grips, and seat also when available..... So, added the seats to the Cali without hesitation. Had them before in previous cars also, all leather seats.... So, now just a given suppose.