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Thanks Matt for the detailed answer. I appreciate it.

We have a lot of duplicate pages (600 urls) on our site (total urls 800) built on the Magento e-commerce platform. We have the same products in a number of different categories that make it easy for people to choose which product suits their needs.

If we enable the canonical fix in Magento will it dramatically reduce the number of pages that are indexed. Surely with more pages indexed (even though they are duplicates) we get more search results visibility.

I'm new to this particular SEO issue. What do the SEO community have to say on this matter. Do we go ahead with the canonical fix or leave it?