Curious if you've used Contentful (http://contentful.com http://contentful.com) or Dato (https://www.datocms.com https://www.datocms.com) yet - and if you have,

Curious if you've used Contentful (http://contentful.com http://contentful.com) or Dato (https://www.datocms.com https://www.datocms.com) yet - and if you have, what your biggest issues were with them. We've used Contentful extensively basically since it's inception, and have toyed around with Dato enough to know what the offering is. We have our own list of missing pieces for both but am always curious about other's experiences.