Shortly after installing it, I had several RTFM questions and filed a trouble ticket. I was amazed to get a response in several hours. Instead of going off on me telling me to check the Forum first (like some other support staff I've dealt with), I received a detailed explanation that was right to the point. He also politely directed me to the available documentation for future use.
One can't ask for any more.
After using it for 3-4 months, I am extremely pleased with the extension. Not only does it display multiple events nicely, but it has excellent search capabilities allowing users to locate what they need quickly.
Entering new items is a little clumsy, but after a little while it becomes easier.
There have been a couple times where I contacted RSJoomla for support. Every time I received a satisfactory reply quickly (usually in less than 24 hours).
I have not used more advanced features like registration or ticketing but I intend to in the future. It's nice to know that they are they when I need them and I won't have to find a different extension to do what I want.
I highly recommend this product to everyone with moderately complex event needs.