Test drive at Mercedes

Hello guys, I want to hear your honest opinion on the topic now, so if there is no polemics. Thanks already the following: Next year I want to buy a new SL. I had tried the 55s at a friend’s. I was disappointed because (for my taste) too loud. But before I order the 600s, I want to test it. I don’t buy a car in the price range blindly. Since I don’t know anyone who drives the 600s, I have stopped at the local dealer, who of course does not have a vehicle like this, but can get one from the NDL Munich. In addition, he also knows that I am driving a comparable vehicle and I am not the typical 22-year-old test driver. 2 days ago the seller called me to inform me that the vehicle available in Munich is now registered and would be available soon, but he probably 250 Euro per plus 2.50 Euro per vehicle value So now your opinion about this?? for comparison: Renting an SL55 AMG costs 390 Euro/day incl. 200 km.