We use Solr to index over 600k documents. It's very fast and has been flexible to use. The speed of indexing individual documents has been great. The most valuable feature has been the powerful search syntax that we use to find documents with specific attributes.
Improvements to My Organization
We now have a much more powerful way to search our set of documents and the open source price is right.
Room for Improvement
Memory utilization could be better but it is an industrial strength tool so some overhead is to be expected.
Use of Solution
Customer Service and Technical Support
N/A - use books and online forums for support.
Doing this again I would look at search as a service solution. The overhead cost of running Solr on a cloud server and the additional storage should be evaluated against something like elasticsearch. Rackspace has not had a search service, but if they did we would consider it.