I like how it's simple, intuitive, and effective at what you need it for. It can be used by anyone whether they are experienced or new to project planning. The interface could use some work - there aren't many options to customize your view of the program (for example, if you want more columns). However, this isn't something that should keep people from using it.
Make sure you have someone who knows how to navigate around the system well so that you don't spend too much time learning how to do