I love this plugin. I've only been using it for about an hour and it's fantastic. I had been using Time.ly's All in One Calendar for a long time but their update kept failing and crashing. Since they removed their plugin from wordpress, I removed their plugin from my site.
Time to move on. CalPress works like a charm out of the box. I spent an hour or so customizing the CSS and creating some child pseudo classes but it was a breeze. Best part is that this plugin imported events without me telling it too AND event categories! Love it.
The only thing keeping me from giving it 5 stars is the calendar view (when using it on a page with a sidebar) cuts off the bottom of a long event description and there's no scrollbar appearing. It also strips out html (a href) tags out of the description too. Wish it didn't but still a great plugin.
I recommend it!