There is a way more powerful and free extension called "MSemantic" available, which also supports GoodRelations (http://purl.org/goodrelations/), which is the NEW e-commerce model in schema.org.
December 6, 2012
Check this one: http://www.magentocommerce.com/magento-connect/marketing/seo/extension-google-rich-snippets-1100.html
1 Minute install and does exactly what it should do.
October 29, 2012
Definitely not worth $ 79 ... There are bugs and only handles reviews and price standards. The support is null I had to provide for me to solve the problems ... I bought it to save time and instead I have lost more ... A tip integrated micro-data in the template
September 13, 2012
There is an error with the formatting of the price.
The product tested is this: http://www.zanchettastore.com/en/halogen-lamp-loft.html
The price is always no Sales Tax (VAT), English in the store is properly formatted but the price without VAT
In other languages does not consider the commas and transforms € 298.00 in 29,800.00
I Magento 1.6.2 with multistore
September 7, 2012
Purchase this extension and waiting for support on error:
CONNECT ERROR: Package file is invalid
'./app/design/frontend/base/default/template/page/html/breadcrumbs.phtml' already exists
July 5, 2012
With some extra help and care from Justin, we've managed to get all the needed data showing up in the Rich snippet Testing Tool. Thanks for the quick responses on our e-mails. This extension will help us to improve our CTR in Google.
February 29, 2012