I'm working on a professionnal project using eZ Find extension and I must say that I'm very impressed by this extension and even more by Solr. Last october at the developper day, Paul Borgermans told us a lot of good points about Solr. I was a bit skeptical about the technological blend (PHP + Java) but the search webservice provided by Solr is a very clever solution much more efficient and scalable than the Lucene extension with PHP Java bridge module and its memory problems.

For the project, I added custom sorting on content object attributes or meta attributes and indexing of external contents (not in the eZ Publish database). Solr is pretty well documented and it has an impressive number of options and can be use in any project.