First of all, on the developper side, it is very easy to fit it in the template and to override the out. With small efforts you can really get something nice (I am not a professionnal web-developper).
On the user-side, the admin interface is very very easy to use for non-expert webapps users (Drag'n'drop interface and clear template) and it will be very complete and efficient for more expert people.
Concerning the support, the team has been very helpful and all my question were answered in a short time.
All in all, it is really the best event extension for joomla: nice looking, easy to use, easy to adapt and the support is great.