When I think about how much I dislike calendaring / pim software on *nix systems, and I see http://calcurse.org/ that looks handy, and that it has a code base that doesn't suck, I kind of wonder what should bother me more. That I'm tempted to try using it, or just how much I dislike using Thunderbird compared to my tablet.
I basically maintain an array of calendars. Most in a certain popular cloud service, segregated for various purposes; and one on my employer's service for dealing with "Damn it, people send me meetings as ics files!".
In practice: I often prefer to reach for my tablet whenever the words Calendar, Contacts, or save when Outlook is involved, Email.