Amazon, Barnes & Noble and L.L. Bean were the three best performing sites reported by Keynote's customer experience rankings, an in-depth evaluation of the customer experience provided by leading retail sites. The company reported that Amazon stood out due to strong visual appeal, easy purchase process, search and product research.
In addition to price satisfaction and eye-catching graphics, ease of use and convenience are the primary drivers for online shopping, according to Keynote, which said consumers are more likely to conduct a transaction if a site meets these needs. Keynote makes full reports available for purchase on its website where it also publishes monthly performance indices.
http://www.keynote.com/solutions/performance_indices/ecommerce/ecommerce.html