guyanonymous,
For awhile I had "Use Metadata from Files" turned on. At another point I also used "Social Metadata".
In either case the metadata obtained (from the file, or online) overwrote any existing metadata I had previously. Particularly with Social Metadata I've seen some strange things (Google only, have not tried ISBNdb as yet). I won't try to provide examples, but I have had entries completely overwritten with garbage (at least, from my point of view) that I had to re-enter.
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