When can I say this sentence?

Some examples of usage of this type of statement:

A: "Dr. ____ doesn't take new patients unless they're recommended by someone."

B: "I realize that, but he's the best in the business."

C: "Why did you choose our firm for this job?"

D: "You're the best in the business."

For example,

Alfredo owns a car-repair shop. I am a customer. Every time I go, he fixes my car perfectly. They finish the work on time. They charge reasonable prices. They have a waiting room with coffee and comfortable seating. They will drive you to your office if you don't want to wait. The employees are all courteous. There are many car repair shops to choose from.

I tell Alfre