My written German is not good, so please excuse my writing in English.
I bought my current car from the same salesman that runs DIT, and have always had it serviced by the same mechanic. They were all at Drakovski before DIT.
I have never had any problems with them. They have always treated me well and given good service to the point where I recommend them without reserve.
I am curently looking to purchase a Prius, and trade in my MR2 and am very happy with the quote they have given me.
When I read the report about bad service from DIT, it really does not agree with my experience.
I guess there will always be people who get bad service from any company, but there are also people who get good service. Unfortunatly, those who get good service rarely say so.