I love that MGRE is integrated with our Epic system to make it easy! The ability of creating reminders at certain time intervals makes my life easier when scheduling patients in clinic or during rounds (which are always busy).
It doesn't integrate well into Google docs so you cannot share directly from your computer if someone wants something written up but not necessarily signed by me yet - which can be frustrating since sometimes they just want an idea thrown out there without really thinking about what will fit their needs best vs mine as physician owner/manager etc.. Other than those two things this has been great!! Easy access via mobile devices too.