Tilo's started as an idependent repair facility. They were so successful at that (and still are)they started retailing a few cars for customers. It then grew to what it is today, but they are still first and foremost a repair shop. I would not hesitate to have them do the inspection for you. I just don't have first hand experience with them on that level.
When I was talking to them I was looking at a BMW 750il they had. Yes, they are on the high side mostly on the back of a belief they offer superior cars with documentable backgrounds. I found them willing to negotiate a bit. But, again, I didn't buy the car. So I am really relegated to [passing on 3rd hand what I was able to find out about them.
Tilo has been there a long time and I have only heard good things.