Volvo will only recommend Polestar as they went joint with Polestar. Again there are many other good reputable Volvo performance mappers out there with a long track record.
I looked at a polestar map for mine, didn't really gain much at all and was incredibly expensive for what it was (I think you are paying for the badge really)
If you are in or care about the manufacture warranty then yes have a Polestar map, but there are other maps which are just as good for a fraction of the cost and are just as reliable.
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