Heartbeat is a very affordable tool in comparison to most other community management tools out there. It's easy to use for me as an administrator and my community loves it too.
For me the events section is certainly the most important part of my business and Heartbeat offers everything I need to manage the events effectively (RSVP, reminders, feedback etc.)
If you are looking for an affordable and user-friendly tool to manage your online community, I highly recommend Heartbeat.