Best experience? My homie @lordbarnhill and I stumbled onto the solution for installing OpenSocial #Drupal8 properly on Pantheon hosting.

Worst experience? Creating a website for a radiology group only to get fired with 3 days left until launch. The "new" developer turned out to be their IT guy in house took 2 months to launch. The experience up to the point of getting fired was excruciatingly detailed and filled with ope creep.