I'm using the Event Calendar for around four months now.
I have to state that I'm really impressed how the calendar and the other plugins are further developed. Around every 6-8 weeks a new release has been deployed with lots of new functions.
The support is really responsive (only the forum software used is sometimes a bit tricky) and the people are really nice and helpful. Ideas for new Features can be addressed and are included in the further development.
Thumbs up for the Modern Tribe! :-)