The extension allows you to add the information you add to the component per product through Tags in the Product Fly Page template.

{isbn}

{mpn}

{upc}

{gtin}

{year_produced}

{expiration_date}

{edition}

{genre}

{author}

If you add these tags to the product template it will show the content through.

Also the system synchronises colours and sizes in attributes, so if you add size or colour info, it can syncronise between Virtuemart and the Google Base component, allowing you to not have to add it all in twice.

I hope this all makes sense.