Solid!

Event Espresso 4 has many great qualities – first of all, it WORKS. Second, GREAT support both from official EE crew and also the community. The plugin and addons are constantly being developed and the developers listen to the community. Event registration modules must be carefully considered because of the wide range of technical requirements i.e. ticket types, date ranges etc. EE4 is flexible enough to be great for 95% of the events companies that I have developed for.

If you are a developer, this is the module for you. Documentation is solid.