We recently replaced a proprietary SaaS CMS for the largest school district in the state (Newark, NJ). We launched our 70+ schools sites on Aug 29, 2014 on top of WordPress. Our district site is 30,000 pages and media assets all by itself. In the end, we cut our annual web site management budget in half and have beautiful new web sites powered by WordPress that ease the pain points our content owners, administrators and technology coordinators have when managing their school web sites.