Right and the ability to customize every nuance of it w/ a tiny bit of Emacs Lisp (or not, that's not required) has been great. For example I didn't quite like

Right and the ability to customize every nuance of it w/ a tiny bit of Emacs Lisp (or not, that's not required) has been great. For example I didn't quite like how org-drill, a spaced repetition extension for org-mode, handled flash-card grouping and drill selection at run-time so I completely customized it with my own group selection interface.