I love these notebooks. I'm working on moving completely over to just using my phone (I no longer guy the actually planners), but there's something about handwritten to-do/to-contact lists. I usually list all of the people I need to call/email (and the topics we need to discuss) on the left page, and I'll have a few different to-do lists on the righthand side. I like the squared version, because then I have nice square checkboxes I can check off when I complete a task (it's a pretty satisfying feeling). It's also nice for taking quick notes in a meeting. I carry this notebook and my phone everywhere, most of the time I can get away with not carrying my laptop throughout the office to meet with people.