The main metric for this project was users engagement, time spent on the site & of course conversion rates. The main ways to incorporate this feature is to integrate it in the product listing for users to easily compare "relevant" products. The comparison could only be between similar sub-category, i.e. laptop to laptop types, etc. The drawback off this feature was the text format within the specification info itself. At the time, most of spec info done in "free text", creating less of detailed info of the items. Nevertheless, this feature still provides value and enhanced users decision factor.
The sticky comparison UI, carried over via product details page. This provides continuation when users decided to compared the product before committing.