We recently published a joint study with Vizu Research on reviews.
The key finding is that US and UK shoppers have more trust and respect for Brands that enable product reviews. In fact, 8 out of 10 shoppers trust and respect brands more if they have authentic, user generated reviews on their site. So, not only do reviews help improve conversion, average order value, returns, satisfaction, natural search traffic, RSS feed click through, email revenue, and offline impact (ask us for any of these case studies)…they also improve brand perception!
Another finding: US shoppers consider ratings and reviews to be the most useful eCommerce site feature (44 percent). Product comparison (15 percent), product navigation (12 percent), and privacy information (11 percent) followed in the distance. We knew this already from site surveys with PETCO and CompUSA, but it's always helpful to get another data point! We're sort of maniacal about data