I like that you can set up multiple schedules for different projects, so it's easy to keep track of all your deadlines in one place! It also has an option for logging out-of office hours or vacation days automatically with calendar reminders sent at due dates - even if a user isn't logged into their computer as needed.
The interface could be more clear when creating new events; there are often lots of options available from which we're unsure what exactly will happen next (or why!). This app lets me easily see everything related to my business without having access to spreadsheets scattered around various folders & files across many computers/devices.