Customers most agreed on the following attributes:
It really does fit as well as the Nikon one, and the plastic has the same kind of texture. And is in stock, for less.
Good alternative to the over priced Nikon cap
Very useful replacement cap for Nikon lenses for a cheaper price.
Super-cheap and very well made. Fits perfectly and it is made in Japan. Looks good on the lens and no one would say it's a 3rd party cap.
I wouldn't pay more money for an original one, unless it's golden plated and sings me a nice song...
My Sigma lens covers would not fit easily on my Nikon lenses, a real pain when in the field. This Adorama cover fits all my lenses with a Nikon mount.
Snaps on nice and tight. Just what I needed
It is intended to protect the lens on a very expensive Nikon and it does.