I've used this plugin a number of times, and it is first-rate.
It works great straight out of the box, but there are plenty of options to dig into should you need to alter templates or query events or event categories.
Excellent documentation and prompt support should you need it. I've also seen some of the author's WP answers on stackoverflow, and it's clear he knows his stuff, and this expertise shines through in this plugin.
Thanks for a great plugin :)