Satzer Granturismo in Hamburg

I am a student from the University of Texas and I am doing a praktikum here at Technische Universität Clausthal in Germany. I'm going to be in Hamburg this weekend with plenty of time to kill and I would like to take a look at the Satzer granturismo showroom. Have any of you ever been there and do they mind if people come in to look at the cars? I'm kind of nervous about going in there since I hardly speak any German and I've heard the dealerships in Germany don't like people coming in if they are not going to be a customer.