Experience with Autoscout24 vehicle rating?

I would like to sell my car and want to know first, what is my car worth? Since there is a vehicle rating at Autoscout24, I want to do it there. Is my second car and only need one more, otherwise I would exchange it with the dealer. How exactly are the reviews, can you take them as a reference or should you then stick to the Eurotax prices? Unfortunately, I am not a member of a motorist club, so I would have to pay something for the query. emand experiences with Autoscout reviews? Do those calculate at car value slightly different or how do they come to the value?