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I have used the 28-300mm on my D800, and I like it. I have many other better lenses, but for an all around lens, with a big zoom range, it works well for me.
I was at a Camera Expo this weekend, and Vincent Versace gave an interesting talk with some slide shows. Prior to starting the formal presentation, he went through his camera bag. He said that when he goes into a situation where he does not know the type of shooting (or focal length) that will be needed, he puts on the Nikon 28-300mm. He said the lens is a compromise, but that it works pretty well for him. I can not remember his exact words, but he does like and use this lens.