Setting it all up the first time is pretty straight forward, customising the layouts needs a bit of effort from you to understand exactly how to bring it all together, but still simple.
I ran into some problems with my latest site (partially my fault, as well as coding issues), and this is the first time I needed more direction than I could find in the documentation/forums.
The response from Geraint (Developer) was right on, very quick to respond, and incredibly helpful. The service and product is first class.
If you want a simple event calendar, and/or the potential to grow into a full blown sales/reservation system then Jevents is the way to go.