I'm intrigued by this Plum Paper things too. I've always felt like my schedule was too fluid for a pen-and-paper planner so in vet school I just used the calendar app on my Apple products...I liked that it automatically synched between my Macbook, iPhone, and (eventually) iPad so I always had the most recent version. I set it up with recurring events for the classes but could still easily drag them around when things got rescheduled. I used different colors to label classes (blue), extracurriculars (orange), work schedule (green), and exams (purple). It worked really well at the time.
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Now I'm wondering about switching back to paper after residency is over in July. I'll probably have a Windows office computer and my Apple stuff at home, so I'll lose that seamless transfer. It might be good to have paper. Will have to think about this more in the next few months.