Overall its a great mod. The events are fun and you have a lot of options when setting up events giving you near endless replayability. As it stands now, this could be its own mode in the full final game. However, there are a few issues that make me give it 4 stars. Some of them could be fixed by the author in future updates while others are results of Beamng itself. First, I don't really care for the mod nearly doubling the number of configurations for some cars' derby versions. I'd like to see those configurations hidden if possible. Second, the AI is sometimes questionable. Its gets stuck in silly places or does weird things. I don't know if this is Beamng AI or something the author could improve on. Third, and this is something entirely on Beamng, cars can sometimes get stuck together. It doesn't happen as often as it used to, but it can still happen and be frustrating. It gets more likely later in matches as cars get more damaged and jagged. When it does happen, I have to try and do surgery with the node grabber to separate two cars. It doesn't always end well.
The issues I just mentioned are pretty small, and they by no means detract from the overall enjoyment.