Author of Epf here. We had used Ember data for over a year before creating and switching to Epf. Epf was heavily inspired (if not directly based on) many parts

Author of Epf here. We had used Ember data for over a year before creating and switching to Epf. Epf was heavily inspired (if not directly based on) many parts of Ember Data. We felt that Ember Data provided the right level of abstraction, but fell short and created road blocks for us in certain scenarios.