Ive used one and I wasnt impressed with it. 640x480 is only vga quality and you can get USB only versions cheaper on ebay.
I had no issue with interfacing it (it wasnt mine). While the one I was using nailed the job I needed it for (looking for a lost socket in a tool box void space) Im not sure it would have had enough resoulution for small holes. That could have just been a lighting issue however.
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