I like that it's easy to use, has many features for my business needs (Scheduling Calendar/Events), can be used as both online or desktop application which makes user experience even better - since we are always mobile these days! Nothing really comes up against this software unless you need something out of its scope.
We have been using NoVacOAST in our organization now more than 2 years with great success rate so far. The support team was able to solve all issues very fast once they know about them. It helps us keep track of tasks easily without having too much paperwork around.