If you have good references that are not directly from [Bauträger], then you can be relaxed. The word [Bauträger] alone can already be an indication of a later problem. I have already heard from many people that [Bauträger] care about arguing to the builder how expensive everything is while at the same time squeezing the craftsmen by claiming that it must be much cheaper. That in itself is still logical. Unfortunately, it is also logical that it usually comes down to profit maximization, and not to saving for the builder. Whoever believes that a [Bauträger] bears a construction also believes that a lemon squeezer folds lemons!