Visitors Voice Site Search Analytics shows what your visitors expect from your content. And how to improve it. Let data drive your work.
Yes, Visitors Voice works with any search engine technology like Apache Lucene Solr, google custom search, Sphingx, Google Search Appliance etc. Its fully vendor neutral.
If you have a website (or intranet) with a lot of information, a site search function and it should matter to you if your visitors find what they are searching for; then Visitors Voice will create additional value to Google Analytics. Visitors Voice gives you suggestions of metadata and shows search behavior on a page level.