Let's say I have a site that sells widgets, and the URL structure is like so:

/[type-of-widget]/[sub-type]/[widget-name]/

So, a URL for a widget might be:

/screwdrivers/philips-screwdrivers/acme-big-screwdriver/

We show reviews on the widget page, and use the appropriate microformat data so Google knows it's a review, etc.

Now, what if I want to show random reviews in the "sub-type" and "type-of-widget" landing pages? Will Google ding me for duplicate content, or is it smart enough to know (based on microformat data/etc.) that this is not duplicate content?