The ease at which you learn how this product works is amazing, there's no prior knowledge required as long as your comfortable with Javascript/Jquery or AngularJS (or whatever framework they use).
There were some minor bugs but nothing major! We needed something in place quickly without having an existing stack already up & running - otherwise we would have been looking elsewhere. It gave us all our needs met very efficiently & effectively within days instead of weeks / months like other alternatives I had looked into before recommending them.