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I think the main advantages of Premium are :
- to have multiple profiles, discriminating different vehicles or using trailers and the likes.
- to have live weather instead of manually enter a single wind direction and speed and a single temperature.
Real-time traffic and charger availability, with prediction based on historical, might be interesting for some.
Keeping your drives stored for later review is interesting but I have that in a better form in TeslaFi.
The rest is bonus IMO. You can see exactly all the things that premium adds here: Premium - A Better RoutePlanner . "Wortth it" is always subjective.