I bought a demo Nikor Zoom 18-200 mm lens and its great! Make sure it comes with a money back guarantee, like any other product you buy.
I love the zoom because I get so many shots I might otherwise miss without all the hassle of changing a lens, not to mention the possibility of dropping the lens or getting dust on the sensor while changing lenses.
Some of the purists think zooms are not as good as fixed lenses but imo unless you are blowing the pic up to the size of a wall or looking at it under a microscope, you cant tell the difference.
One really important thing is to buy a name brand lens like Nikor or Cannon and stay away from the bargain basement ones. The colors often get shifted because of the inferior coatings and the resolution is not there. And dont get a great lens either and fail to protect it with a UV filter on the front or screw it up with a cheap filter either.
No matter what kind of camera you have, no matter how advanced it is...if the lens is bad the pics will disappoint so dont be cheap! But to answer your question directly, I would have no problem buying a factory demo or refurbished lens.. its not like a car.. i mean, really, how much wear and tear does a lens get?
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