At kosmex, we have supported our customer topgifter.com a gift shopping portal migrating to the new solr cloud platform.
Migration to solr cloud for topgifter has given them capabiility to scale and increase the content on the site. We have been very happy with performance of solr cloud. We specially like the auto sharding, distribution and replication features of solr. We would be happy to help any customers who would be interested in considering migrating to solr cloud for search needs. Please email us at firstname.lastname@example.org for more information