I have used a few of these type of Event extensions, EventList, RSEvents, and Event Booking. They all have their pros and cons but for me, online support is paramount. However, I have to say that all three developers could find themselves typing much less if they would spend the time creating better documentation. Unless you are just using the very basics of these extensions, you will be spending a lot of time in the forums or creating support tickets. It seems to me that a few weeks spent on creating some good documentation could save these guys countless hours of support time. having a quick start or getting started section is hardly an excuse for DOCUMENTATION to these robust extensions.
Although this is not the place for an in depth review of all three, I will say that no matter which one you choose, unless you are just using it with its default settings, be prepared to spend some time creating support tickets to get your answers instead of saving days of time being able to read in depth documentation.