I wish to write a strong commendation for Jeff Mantell. I have know him for at least 15 years and try to buy all my photographic equipment from him. He is a salesman extraordinaire. This is meant not as someone who could or would sell you the Brooklyn Bridge but because of the exact opposite. There have been many a times when I wanted to purchase a lens or camera body and Jeff would actively discourage me. " You don't need" or "It isn't compatible with the way you shoot" are frequent refrains from him.
As to his knowledge of equipment, it is superb. He maintains connections and relationships with all the major manufacturers and not only knows all about presently available equipment but what is coming in the next six months. He will discourage a customer from purchasing something if he knows something better is coming and there are times when he will suggest getting something now because it is a better "buy".
What can I say, he cares deeply about his customers, which is probably like me, they become great friends.