In 2010 I was one of four people assigned to a task force implemented to start a complete redesign of Northeastern University Libraries website. We wrote and sent out an RFP, organized incoming bids, chose iFactory as our vendor, researched CMS options, and managed the entire process alongside the vendor for over a year. The new site went live in January of 2012. Our research into making a CMS recommendation of Drupal 7 (and my design of the research for an infographic) ended up being included in the ALA 2012 Annual Conference's Poster Session.
We worked closely with iFactory to redesign the IA, conduct a site inventory, and adhere to the technical specifications that we had outlined in the RFP. The redesign has been wildly successful and using Drupal was a great decision.