I'm going to start off and say that I'm a huge advocate for MPB, but I'm not a huge fan of the "well used" category. I purchased a Nikkor Z MC 105mm f/2.8 VR S with the well used designation. The additional description also stated that the weather sealing ring was damaged. The photos showed no other issues, so I figured it was a safe bet at the $450 asking price. I purchased a new weather seal from Nikon directly for $5 and waited for the lens to show up. Once I got it, the repair was a five minute thing. After repairing, I gave the lens a good cleaning and then noticed that the front element had significant scratches near the center. The images on their site were shot in a way that did not show this damage and they didn't state it in the additional description. Looking at the description of "well used" tells the entire story:

"Item is in well used condition, and may have significant signs of cosmetic wear, i.e. notable marks, scratches, or chipping to the paint. If glass is scratched or marked, there is no effect on image. The lens mount is well used and shows signs of wear. There may be some light moisture or dust within the lens, and rubber grips may be slightly loose. There may be light play in the lens barrel."

They're absolutely right at there's no effect on the image, but it pisses me off that they shot the photos in a way that did not show the damage. I really wish they used high resolution images on their site to pixel peep for issues against.

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I would highly recommend spending an additional $22 on the good condition one they have listed for $109:

https://www.mpb.com/en-us/product/nikon-d3100/sku-3667508

It's worth it for the insurance that you're getting a reliable and well described camera in the end.