Strangely absent from the blog post, or the article on which it is based, is the price of the vehicle. It mentions "numerous Tesla Model 3s", but I suspect that this thing costs more than a Model X.

The other factor, of course, is infrastructure. What is the availability of Mercedes-compatible chargers, compared to Tesla?

Edit: I stand corrected on the price. I don't know about Germany, but pathartl's quoted US price, while quite a bit more than a Model 3, would be less than a Model X.