Arktic winter tyres

Hello, does someone have experience with retreaded winter tyres Arktic M780? According to Reifendirekt.de: “The run-oriented winter tyres with excellent winter characteristics”. They are supposed to survive on an 18-year-old passat, which maybe with luck still 1x the TÜV. So I ordered 4 parts of it, everything worked well, but the master in the workshop said to me that 2 of them had an extreme height and side impact and would not be properly balanced. Now I am thinking about n, whether I should send all 4 back, or send me 2 more from the variety, maybe they are better. About retreaded winter tires you can hear the most different opinions. Would be grateful if someone could give me a hint, who has already driven these tires.