Last year I mentioned getting a Nikon 28-70mm f/2.8 lens in EXCELLENT PLUS condition from Keh.com but returned it. There was an intermittent problem with the aperture blades not stopping down all the way causing some images to be 1 stop overexposed. The cost was pretty high due to the supposed excellent plus condition of the lens, but after a great deal of thought, I decided to go with something less expensive as a precaution.
So I chose a Nikon 28-105mm f/3.5-4.5 AF-D lens also from Keh.com. This lens was also listed in excellent plus condition but wasn't nearly as expensive as the first lens. Well, when zooming, the lens would catch at 35mm no matter which direction I zoomed. I could zoom beyond that point, but there was a definite hiccup at 35mm. I called and spoke with one of their reps. He said that issue isn't acceptable for the grade of excellent plus (90-96% of original) and apologized. They had a couple other copies of this lens so I asked if I chose another, could someone check it first.
He said the place where the lenses are kept is separate from their phone center so that wouldn't be possible. Keh received my return and once again has it listed in excellent plus condition.
So now I chose the same lens through an Amazon seller. Even though this seller doesn't have a lot of ratings, he is at 100%. I'm hoping this copy will be in better shape than the one from Keh.
I am disappointed in Keh. I've heard great things about their gear. Even bargain items have been mentioned arriving with what customers think are higher ratings, but unfortunately that hasn't been the case for me when it comes to gear. I HAVE ordered used accessories from them without a hitch though.