Since August 2008 when we first released a Google Product Search (Google Base) module a lot has changed. Not only has Google’s own service undergone a series of changes to the feed specification, Prestashop has also moved on.
The release of Prestashop 1.4.x in particular has seen support for many of the additional data items not previously possible to include, along with major changes in the generation of SEO urls which alone merit a code refresh. It has also become much harder to get good rankings in Product Search as the uptake has increased, and more attention needs to be taken in terms of feed data quality than ever before.