So I was looking into this a little more - it seems that the extended POI files have a very limited selection of POI categories compared to the normal POI files - for example there isn't even a restaurant category at all in the extended POI files (at least in my search area) - so it's pretty obvious that the extended POI files are meant to be used along with the regular POI files and are not replacements for the regular POI files (like I had originally thought they were).
I did find some duplicates too - Starbucks (in the "Shopping" category) seems to have duplicates as well as some gas stations. I even found duplicate entries for Starbucks just within the regular POI file alone! :-)
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