Thank goodness it no longer works now, Penguin and Panda are crushing these schemes.
These are quite common with auto submission/ Link building software organizations as well.
Run! 
Best posts made by pshithappens
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RE: Exchange Links - Problem or Not ?posted in Technical SEO
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RE: Does Schema.org markup create a conflict with Power Reviews' standard microformat markup for e-commerce product pages?posted in Algorithm Updates
You can use the tool in Webmaster tools ( it's new), that will show you the markup on the page. I haven't noticed that the power reviews interfere with the proper structure of product schema.org on my clients.
The tool will show you the mark up and the results.