Jumi is the full fledged "upgrade" to ANY Joomla install in my opinion! Being able to leverage scripts and simply paste them in adds tons of uses for the novice level plus unlocks the true potential of Joomla by turning into a development framework for the more advanced users.
Easy to configure and setup up. Adding and changing events is a snap, and changing the way they display to the user is similar to the way a professional calendar software works. You can 'skin' this thing using the css. Perfect.