I like that it's easy to obtain a list of attendees, both past attendees and future attendees. I also like that it's easy to communicate with attendees by sending mass emails through Eventbrite.
The design of the app is clean and professional looking.
Multiple ticket types can be created and payment is straightforward for attendees.
Lastly, it's free to use for free events, so that's really nice. Review collected by and hosted on G2.com.