During the 2014 Drupal Devs Days in Szeged Hungary, Bram Goffings (aka aspilicious) and I had a chat about his experience upgrading Display Suite early on and maintaining it during the ongoing Drupal 8 development cycle. He says it was a great learning experience and that it is time for everyone else to start their upgrades in preparation for the Drupal 8 beta release.
Read the full post and see the conversation video at the Acquia Developer Center: https://dev.acquia.com/podcast/132-upgrade-your-modules-drupal-8-now-bram-goffings