Several clients I've worked with have integrated Google Base. I've always wondered how much Google Base actually impacts traffic without having access to the data.
After the recent development of a google base spree extension, we've been able to measure the significant impact of search engine traffic directly related to Google Base. The extension was installed for one of our Spree clients. See the data below:
Although the extension is relatively simple and has room for improvement (missing product brands, product quantity), you can see how much traffic was impacted. Hopefully with future extension improvements, traffic will increase even more.
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